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모델 A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac12,2

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What GPU's are compatible with iMac 27" 2011?

I have an iMac 27" mid-2011 with a semi-dead 6970M, 1gb GPU - I only got the system to boot by disabling the GPU kernel extensions(moving /System/Library/Extensions/AMD* to a backup location = weird and slow graphics, but better than just a gray screen) and Apple has refused to fix the problem because it's more than four years old - even though it's a recognized issue.

So, I need a new card.

  • Are all MXM 3.0 B cards compatible or does the card need Apple firmware?
  • Would a 6970M card for a Dell Alienware laptop or another card with the same chip as one of the iMac 2011 models work?
  • Where can I get a card that works? (<400$)

I've see a lot of questions and answers that dance around these questions but none that actually answers them specifically so ANY help will be greatly appreciated.

Update (03/17/2016)

  • ''Are all MXM 3.0 B cards compatible or does the card need Apple firmware?"
  • "Would a 6970M card for a Dell Alienware laptop or another card with the same chip as one of the iMac 2011 models work?'

I found out Apple uses special firmware and for a card to work it needs an EFI flash with Apple firmware.

A card without Apple firmware will simply result in a black screen.

A friend of mine did suggest I could remove the BIOS/EFI-chip from the original board and reflow it onto a cheaper card - but that will probably be too complicated for a lot of people and I already had a new card on the way.

Cards that already have Apple firmware (pulled from iMacs) are interchangeable though - I upgraded from the 1GB 6970M to the 2GB version.

  • "Where can I get a card that works? (<400$)"

You can get a working card on Ebay or Aliexpress - any MXM 3.0 card pulled from an iMac should be fine. I paid ~300$.

Lastly, as @mayer pointed out, if you have an iMac 27" Mid 2011 with issues, the GPU is most likely the cause and Apple will fix it if it's no older than four years, because it's a recognized issue.

Apple refused to fix this one because it was sold in 2011 but if you want to fight Apple, maybe that'll work too - I chose to fix it myself instead.

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try to reflux or reflow the gpu

reflux or reflow is not working you need a new chip

I can find a $400 HD6970m 109-C29657-10 part for your replacement. Let me know if you need it.

I think I'm in the same boat here. I was thinking of fitting a Radeon 6970M into a 2009 iMac.

My questions are:

Can I use a Windows Laptop (alienware etc) 6970M GPU card and reflow the firmware chip.

What are the model numbers of these cards (e,g. 1GB & 2gb versions)?

What is the name of the GPU chipset used on the iMac 6970M? This is incase I were to have a new GPU chip reflowed to the existing video card i have.

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I used one of the Dell / Alienware 2GB cards. These can still be got for under $200 on eBay. The Apple card is identical in every way except for the firmware.

This is the Dell / Alienware card here

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Grab the Apple ROM file from here: https://www.techpowerup.com/vgabios/?arc... Pay attention to the VRAM size and get the correct file

Prepare the card by removing the Dell metal bracket that the heatsink screws into on the back of the card. You will need to transfer the bracket from the Apple card. Transfer anything else that might be needed.

On the card, with the MXM connector facing downwards and the ATI chip facing you. There are 2 small black chips to the top left of the ATI chip. (one above the other) You need to flash the top one as shown

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You will need a way to interface with the chip on the card. I used a Raspberry Pi with a SOIC 8 clip.

Install Flashrom on the rPi. Use the guide here.

https://tomvanveen.eu/flashing-bios-chip...

Connect the rPi, the clip and plug it in. I have my Pi setup as an access point with its own Wifi network. This way, It is portable and can be run of a power bank

scp the file onto the pi. "scp filename pi@ipaddress:/home/pi"

Backup the existing ROM first,

Flash the card and the card works perfectly as a genuine Apple card. I flashed the 1GB VBIOS version first before realising that I had the 2 GB card and had to dismantle the iMac again to reflash the card with the correct ROM. (I repeat, CHECK YOU HAVE THE CORRECT FILE)

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After flashing the correct file it should look like this

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You will get proper boot screen. No Kext hacking etc. The card works with full acceleration and passes Apple Service Diagnostics

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Good luck and save yourselves a few quid.

EDIT - The M8900 Firepro is the same card so can be flashed with the Apple firmware in the same way as the Dell card.

Note, As this guide is now over 3 years old, time has marched on and not been kind to our 2009-2011 iMacs, The main issue we are all facing is the lack of Metal support with the AMD cards (If they haven’t failed already) As most of you are probably all aware, there are some great developers on the scene that have devoted a lot of time into keeping our old unsupported Macs on the road. Special credits must do to DosDude who created the Mojave and Catalina Patcher tools to allow people to run these operating systems on their older unsupported Macs.

Unfortunalty with these iMacs, It can be done but requires a more up to date graphics card. There are 2 cards that I have found which offer boot screen and Metal support. There is a size “B” card for the 27” iMacs and a size “A” card for the 21.5” Macs. The size “A” will work in both.

As of Feb 2021, the recommended card which has Monterey support is the M5100 Firepro. Nvidia cards are supported up to Big Sur.

All cards are supported in 21.5” and 27” iMacs with the exception of the Late 2009 21.5” Core 2 Duo. The Late 2009 27” Core2Duo IS supported. Pair this with a Wifi card from a 2015 or newer MacBook or iMac and you will have a fully supported iMac with Handoff etc working. The M5100 is difficult to setup initially as the system will not boot normally without the bootloader in place. I can be contacted on the same handle on Insta if anyone needs a preconfigured link to an ISO to get up and running with these cards.

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Hi Allen, I'd love to hear more about how you did this. Do you have a tutorial anywhere? Would be handy...

Hey Allen, is this still working for you? I need to fix my wife's iMac, and I'd love to just grab one of the Dell/Alienware cards and flash the ROM. I am fairly competent and confident that I can do it (I work in a data center, on computers all day long), but I'd love to know if you have any sort of further detailed steps. I really think your answer should probably be the best one, overall, too.

The card is still working perfectly. I will post a howto shortly

Updated Post with Pics

Hello Allen, I was wondering if you could give a step by step guide for the flashing process please? I bought the Raspberry Pi 3 but I don't know what commands to run to backup the original Bios and how to copy over the new one. I was also wondering how to access the backup ? I was thinking I could just copy the Bios from my good iMac with the same GPU and flash it to my new one. Thank you

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Most nvidia GPUs will work if you install the web drivers. Take a look at this... https://www.ifixit.com/Story/18646/Succe...

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@moohaha = Jason, that's great that you found a solution! As it was answer I changed this from a comment to an answer. The only problem I see is the price tag I saw of $2400 for that chip. Apple has now declared this a legacy machine due to its age. ASPs are being told that parts and service for it are no longer available. Thanks for posting you story.

Your very welcome! Note that you will lose your boot screen (grey startup screens) and your brightness controls (system stays at full brightness). As for price, yeah not cheep but I was going for speed :-). I think I paid 400 on eBay for it.

To make a non-apple provided Nvidia graphics card work in macOS Sierra you need to do the following…

Start the computer in safe mode by holding shift.

Get your BoardID by running this command in terminal

echo "<result>$(ioreg -rd1 -c IOPlatformExpertDevice | awk -F'["|"]' '/board-id/{print $4}')</result>"

Open the AppleGraphicsControl Kext using this command

sudo nano /System/Library/Extensions/AppleGraphicsControl.kext/Contents/PlugIns/AppleGraphicsDevicePolicy.kext/Contents/Info.plist

Use the arrow keys to go down until you see <key>ConfigMap</key> followed by a bunch of keys and strings.

LOOK FOR YOUR BOARD ID…

IF IT IS LISTED: Change the string to <string>none</string>

IF IT IS NOT LISTED: Add it in the same format as the ones listed.

Save the file by pressing Ctrl+O, then enter.

Exit by pressing Ctrl+X

Rebuild the kernel cache using the following two commands:

sudo kextcache -system-prelinked-kernel

AND

sudo kextcache -system-caches

Have Fun!

Thx Jason, very precise response

Jason, are those instructions for before or after GPU replacement? I swapped out my GPU and now have a black screen. Cannot start up in safe mode. How do I access the display to run those commands in terminal?

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Check this out FIRST before you spend any money:

https://support.apple.com/en-us/HT203787

iMac (27-inch): AMD Radeon 6970M Video Card Replacement Program

Apple has determined that some AMD Radeon HD 6970M video cards used in 27-inch iMac computers with 3.1GHz quad-core Intel Core i5 or 3.4GHz quad-core Intel Core i7 processors may fail, causing the computer’s display to appear distorted, white or blue with vertical lines, or to turn black. iMac computers with affected video cards were sold between May 2011 and October 2012.

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"...Apple has refused to fix problem because it's more than four years old - even though it's a recognized issue."

Try again. Force the issue up the food chain. Even write a letter to Tim.

Anders - You down voted me for trying to help you?

Yes, I did. I appreaciate you trying to help - but as to the question "Was this answer helpful?" the answer is clearly no. Copy-pasting a paragraph from Apple support that answers neither of the questions at hand - is not helpful.

I've undone the downvote - someone coming here with a completely different question might find it helpful.

Anders - the answer was specific to your machine and the problem it's having and a possible solution. It's a known issue by knowledgeable technicians. The only reason it did not resolve your issue is because of Apple's corporate greed and their refusal to do the right thing. Your argument or comment that I that I cut and pasted it is inane. What is germane is that I knew about, knew here to look and find it and got it to you. Now you can either suck it up or do what both Dan and I suggest, go fight for repair! Go up the ladder, force Apple to do what is right. There was Class Action Law suit on this.

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Adding my experience here. I had a 2011 27 iMac’s GPU go bad with the pink vertical lines. I’m in rural South Korea, so there weren’t a lot of options.

I considered baking, but longevity was an issue. This discussion and others like it helped me along. I got this Dell/Alienware GPU from Ebay (below, Apple on the left; new card on the right, note the two silver squares that have “R22” printed on them … those are too high for the heatsink and it’s not a perfect fit) and installed that with iFixit instructions (although there are no instructions specifically for a GPU swap on this model, the dual-drive install instructions got me where I needed to go.

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The card is the correct size, but two parts on the card were too tall and left a big gap when the heatsink was put back on (below).

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I salvaged two copper squares from the heatsink of an Apple laptop and used them as spacers with a generous helpings of Arctic Silver between each layer.

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After that, I screwed the heatsink on tightly. It sits a degree or two off-straight, but works fine (below).

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I got everything back together and booted to a black screen and waited (remember, this is the result of no Apple ROM). It all worked perfectly once the iMac reached the login screen. I installed Brightness Slider to adjust the display brightness and it works well enough.

After about 3 hours, the iMac went to sleep and when I woke it back up, the right half of the screen was about 50% darker. On a dead cold boot (e.g. after the weekend), the screen was normal, but then after a short period, the right half of the screen would darken.

I could still see things and get work done, so I put up with this for a few weeks until I had time to deal with it. The iMac itself was running just fine. When I had time to open it and lift the LED, my diagnosis was confirmed: the display data cable was getting too hot. There is tape to prevent, but it was worn/melted slightly (below).

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I used more parts salvaged from the laptop to raise the display data cable up more than it had been. You can see in Step 10 of these instructions how the foam is strong and probably does the job right, but mine computer wasn’t like that, it was smushed down quite a bit.

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I salvaged tape and the foam from the laptop. I didn’t need it to do much other than keep the heat off of the cable. I assume that because the heatsink didn’t fit properly and I didn’t pack all the chips with thermal compound (I didn’t have any), that excess heat is coming off of the wrong side of the GPU. This is something to deal with later.

The cable got the height needed when I lowered the screen back down.

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The iMac works flawlessly now. I’m running High Sierra with the CUDA and web drivers suggested in this post. I did not need to have the drivers installed before swapping the GPU cards. YMMV.

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What Dell/Alienware card did you use?

The one I linked to above (Ebay):

"Nvidia GeForce GTX 765M GTX765M 2GB MXM 3.0 B Video Graphic card"

Probably following the Ebay link will get additional search results with the same/similar enough card, if that specific vendor is sold out. ;)

So the card worked without the apple rom? Or did you do something after installation? Is this why you needed the app to adjust the brightness?

Thanks!

the gtx 680 is an apple suggested card for Metal support and its drivers are built into the OS. have successfully flashed a PC desktop version of this card for Mohave on a 2010 Mac Pro

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Same $@$* here in Hungary. Apple don't care about customers even they paid a lot to buy the flagship of Apple. It's a shame, in this big company. VW, Toyota etc... called back all the cars, which they put wrong spares. Apple just give 4 extra years, even they proudly says, they know they put wrong sparepart to their most expensive product.

I don't know even why any lawyer doesn't see the business in this easy possibility to get a lot of money from Apple??? :) They &&^&@@ up us easily with a lot of money...

Is there anybody, who bought used Video board to fix it? I sent mine to repair to a specialist company to greece to reballing, but it wasn't help. They tried two times, but finally sent it back with the money. I found lot of used cards on different market sites, but i don't know, how will they work, how long... I don't trust Apple anymore. Now I have an 27" Imac I7 8Gb Ram and cant't use. The complete, used, same, working Imac is 6-7-800 Euros, and used card is 300 euros..

Is there somebody with used card experience?

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Sorry you've had such a hard time ;-{

We have 20 of these all are working flawlessly in an office environment! Yes, we had a few which needed a new GPU card and we did managed to get them covered under warranty, sadly Apple has ended the extension now.

The people who have multiple failures tend to be pushing it beyond what it was designed to do. Often I hear about people running some very heavy graphics gaming on this system. This series is just not able to handle the higher heat it creates. I would recommend you monitor your thermal sensors via a good app like: TG Pro and you can use the Turbo function to enhance the fans cooling a bit. Just don't over heat the system.

As for using a used board it can be a bit of a crapshoot as you don't know if its about the fail for the same reasons yours did.

As to re-balling the GPU chip to use better solder thats an option but the underlying issue still remains overshooting the thermal window of the system.

Think of it this way you wouldn't take street car to the race track to run a long race high speed rase as the car would fall apart for overheating. While it could handle a short run of high speed its just not designed to sustain that.

Computers are like this, often we fail to realize how hard we are pushing them until they fail and then blame the maker and everyone else instead of being careful we don't over do it. Some of the blame is also the companies that sell us these great games but fail to list how hot your system will get when playing them and the risk of overheating your system with extended play.

Hi Dan. Interesting that you feel that those with multiple failures are down to pushing machines too hard. I've had mine since 2011, and don't use it for gaming. It just runs a plex media server in the background and I use it for regular work. Yet it has still failed twice. What I really couldn't believe is that both cards lasted the same amount of time, almost to the day! I'm resigned now to using it for a couple of years and then selling it on for whatever I can get at that point. Chances of an economical repair in another two years and 8 months (clock ticking :-)) are slim I feel! It's just not good enough from apple to knowingly replace a part with one is going to have the same issue. Whole batch should have been recalled and replaced with another model. Or they could at least have offered a trade in.

Dave W - Sorry to hear you got a double whammy. I guess we were just lucky.

I do think the AMD Radeon 6970M Video Card tends to run hot and the lead free solder used was just not able to handle the heat. So one could argue AMD messed up and one could also say Apple screwed up by not building in better cooling in the system. While I did focus on the user side a bit in my answer in the comment it still the root issue for many failures across all systems.

We addressed the cooling side of the issue in our iMac's by using TG Pro in turbo mode to push the cooling sooner so the thermal threshold of the solder breaking down is not hit as often or for so long. That maybe your answer as well.

Remember we have a bit of 'Ying-Yang' between the hardware and the software. Back then (2010-11) the hardware was still trying to catch up with the software. During the next 4-5 years the software just eclipsed what the hardware was designed to do (i.e. gaming). Even image & video editing was pushing things.

It was not until late part of 2012 did the GPU's get to a point of catching up and as you know today the CPU designs have been focused on their power and heat. Sadly, dedicated GPU's are just now catching up with the CPU's using less power and heat.

If you look back in the trade rags you'll see it was Apple who pushed Intel into addressing the power & heat of their CPU's as Apple was struggling designing the slim systems of the iMac's with the more powerful CPU's & GPU's. Even still the iMacs are not heavy duty gaming machines, they are a mid tier system.

If you want a heavy duty gaming system I would have said the Mac Pro would have been my choice a few years ago. Now we are waiting for the Mac Pro upgrade hopefully it shows up this year. We really need better onboard graphics and video output. The dual AMD FirePro D700 systems are starting to show their age and just can't push 8K (4320p) which is now the benchmark.

Surprising! The CPU's are not whats holding the system back. While I would still love to see more powerful CPU's the hardware design limits what can be used until Intel offers lower power & heat version of CPU's which are coming this fall in the Xeon family.

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I've repaired a couple of Mac's by removing the videocard, stripping it from all thermal-fluid, plastic etc. Put in in the oven for 8-10 minutes at 200 degrees Celsius , and putting it back (using new thermal pasta). This will let the soldier melt a little bit so any short-circuits don't appear anymore causing the GPU to work again.

it's difficult and time-consuming but it beats replacing a GPU for a lot of $ (or € in my case :)

And some PC laptops have the exact same problems with the GPU. Sometimes the thermal pasta or copper heatsink won't be doing it's job right causing the GPU to get real hot and fail eventually. A lose connection with one of the chips is mostly the case (also from using environmental friendly soldier)..

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I did the same with good success.... but alas, after about 5 months the problem returned. I'm not sure if this is worth the hassle much more and there are not really good options out there given all these cards turn to crap unless someone completely re-balls it with quality solder :(

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I am also an owner of dead imac 27” 2011 with 6970 1gb gpu. And I am wondering is it compatible with previous 2009-2010 imac models? E.g.

2009 iMac

gt120GF 256mb

gt130GF 512mb

9400GF 128mb / 256mb

4670 256mb

4850 512mb

2010 imac

4670 256mb

5670  512mb

5750 1 GB

Or at least with 6750M 256mb/512mb or 6770M 512mb from imac 2011 lower models?

Because used imac 27 costs about $600-700 for now, and spent half of this price for another used 6970 gpu is not a good idea as for me. Especially if I am not needed in 3d graphics

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Hi Do you have any answer to this in the mean time? I have 4670 256mb . Would it work as a replacement for the 6970 in a mid 2011 imac? thx!

Did you get any more info on this?? I have 3 27” iMacs (i7 2009, i5 2011 and i7 2011) I’ve successfully booted the 2009 with the 6970 and the 2011 with the 4850 but you need to use the heat sink from that original machine otherwise it doesn’t sit properly in the MXM slot, so I had to transfer the card to the heat sink of that machine...make sense?

6750M from 21“ 2011 also works in the 27“, the older 5xxx will not work in the 2011 models

@Earlegray, the donkeyrider

Yes I have replaced my dead 6970 with HD 4850 and I can confirm that it works.

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I’ve also found this forum thread to be incredibly helpful in determining the appropriate ROMs, MXM Cards, etc.

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Hey all.

I just bought a Mid 2011 27 inch iMac from Gumtree here in Australia.

I know I've well missed the replacement date for the video card change over by Apple.

Can someone please tell me, did Apple simply replace the cards in these iMacs with the exact same video cards? Obviously with newly manufactured ones?

Or did they change to something slightly different?

I don't won't to muck around with flashing ROM’s to a different card or try a temporary bake fix.

Cheers.

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I had the same problem in my 2009 imac. I replaced the 4850 with a 5670. My 6970m in my 2011 just died today and i'm planning on replacing it with at 6750 or 4670 or 5670 or 5750. Whichever is cheaper. I'm not a gamer lol

They used exactly the same cards. iMacs that went under the replacement program also died a few years later.

I also have a dead HD6970 2gb on i5 iMac 2011. Has anyone been able to use a HD 4670 256mb from a 2009 iMac in a 2011 27” iMac? I just need to get the machine up and running for admin purposes, no gaming or video editing needed

@Earlegray, Yes I have replaced my dead 6970 with HD 4850 and I can confirm that it works.

@onygen, What model iMac did you have? I am trying to get the HD4850 to work in a iMac 12,2 that had a failed 6970M. I installed the HD4850 with the stock heatsink without any problem, but cannot get the card to boot normally. It shows it installed in safe mode, but either hangs during boot or displays abnormally and freezes. Thanks!

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To make a non-apple provided Nvidia graphics card work in macOS Sierra you need to do the following…

Start the computer in safe mode by holding shift.

Get your BoardID by running this command in terminal

echo "<result>$(ioreg -rd1 -c IOPlatformExpertDevice | awk -F'["|"]' '/board-id/{print $4}')</result>"

Open the AppleGraphicsControl Kext using this command

sudo nano /System/Library/Extensions/AppleGraphicsControl.kext/Contents/PlugIns/AppleGraphicsDevicePolicy.kext/Contents/Info.plist

Use the arrow keys to go down until you see <key>ConfigMap</key> followed by a bunch of keys and strings.

LOOK FOR YOUR BOARD ID…

IF IT IS LISTED: Change the string to <string>none</string>

IF IT IS NOT LISTED: Add it in the same format as the ones listed.

Save the file by pressing Ctrl+O, then enter.

Exit by pressing Ctrl+X

Rebuild the kernel cache using the following two commands:

sudo kextcache -system-prelinked-kernel

AND

sudo kextcache -system-caches

Have Fun!

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it is asking for a password......

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Hi all! Same story with my late 2011 imac and the 2Gb 6970M. Took it to an Apple service and told me it had to be replaced, about 800euros. Talked to Apple who refused to replace it through the program according to, first, it was bought in 2011 (more than 4 years ago) and later a superior told me that my imac was from an specific production line that had not the problem and thus not fitting the replacement prog. Though (sigh) my card is dead and I find no reasonable replacement in ebay or similar. Took it to a non official service to do the reballing but it didn't work, it was deformed and not fitting anymore.

Shall you get together to do something with apple or a change.org or something, please let me know! From Spain

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Interesting.....

My iMac from the same series went in just last week because the 2Gb card died. Apple Store was very good and said even though it's outside the replacement program dates (it was purchased in Aug 2011), they would cover the cost. It's taking a little longer than their usual timeframes for repair waiting for the part, but at least I'm not out of pocket for the repair (about the same cost as the lowest end iMac). Mind you, our consumer protection laws in Australia are very good and given it was a known issue to this model Apple may not want to test the laws with a denial to repair.

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Make it fast as the program will expire at the end of the month!

im having mine fixed with same problem, was purchased summer 2012, apple should take care, but the imac has to go thru some test to see if that particular machine and the problem that it is presenting fits in their replecement program, ive been lucky 3 times, 2 macbook pro and now this imac 27 mis 2011. Any certified apple provider should run these test and verify, and I live in the Dominican Republic, all from here and free of cost, in the states should be smoother.

Waldo

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I think I'm in the same boat here. I was thinking of fitting a Radeon 6970M into a 2009 iMac.

My questions are:

Can I use a Windows Laptop (alienware etc) 6970M GPU card and reflow the firmware/EFI chip from an existing 6970m 1gb.

What are the model numbers of the Windows LapTop cards (e,g. 1GB & 2gb versions)?

What is the name of the GPU chipset used on the iMac 6970M? This is incase I were to have a new GPU chip reflowed to the existing video card i have.

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Best to create a new question here with your systems details.

Did work ? I'm going to do that tomorrow

It works :) the only bad thing is that the fan is working at full speed even if the card is cold

did you connect the sensor? If it can't read the info fan will go crazy.

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I'm in the same boat. *Just got this 2011 iMac 27" and the video card is bad.

Apple will not repair free, $576 @ local Apple store. I called APPL corporate, they guy looked into it and said "no". I even emailed tcook@apple.com and asked for an exception. I believe it's *worth repairing, but I'll also want to add an SSD while the work is done. Still searching for a local repair service... Ugh.

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Had mine replaced last week for free. It's the second time it has gone, both times the cards lasted for exactly 2 years and 9 months before failing. Apple initially said no to me in store and were going to charge £500+ until I gave a consumer law argument that the product was sold by apple defective, and then replaced with the same defective part (hence it has failed again). That argument worked for me in the UK, but expires after 6 years so it won't work again! It also only applies where the product was bought from apple direct, as consumer law responsibility applies to point of sale.

I know I've been lucky but it is still not nice to know I have 2 years and 9 months to go now before my iMac (which is otherwise perfect) dies again, and presumably at that point it will be declared vintage and parts unavailable.

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My iMac (i7, mid2011 gpu with 2Gb) just died this week. I brought it back to my Apple reseller for repair and hè suggested me to provide the original purchase note, because Apple sometimes because of consumer laws decides to repair this without charging costs. I have had many pc's before I got this iMac and never had a dead GPU.

PS my iMac was part of the series that could have defective GPU's, but I never traded in my iMac since I had no problems. I agree with some of you that Apple should have proactively recalled those iMacs and replaced the GPU's.

Lets see what happens with my repair request..

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Update: my GPU died indeed and I got it repaired for free by Apple based on the European consumer laws ! :-)

I'm really glad to hear, your apple fixed by the law, but hearing this, is giving me another $@$* think. How can it be, some apple store/service do this for the customer and some others f@ked up us??? This is really mess and disgusting at Apple! Shame, shame, shame...

Hi Niek, same problem here. Where do you live? Country/city?

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Hi,

My Mid-2011- 27" i7 iMac graphics card failed and Apple replaced it at n/c.... then 2 yrs later the replacement failed - they wanted $900 to replace it.... I really like my iMac (I had added a 4TB HDD and an SSD)... so I went on ebay and found a used one for <$300 and spent a lot of time on You Tube looking and reading and finding the "special thermal grease" from Greece. It takes time patience, static protection, lots of paper towels, some lighter fluid to clean off the old thermal paste... and luck. It took me a couple days to finish, and it lives again. I also read that the apple fan control system is more for sound than safety - I use Macs Fan Control now and am happy with a noisy/cool iMac to be able to process my work file.

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take out your videocard, clean it off, take a heat gun and move it back and forth over the chip for 30 mins put it back in, and pray. im writing this on a imac i repaired this way

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I have seen others baking. Any reason to go heat gun and any specific instructions? How long has your repair lasted? Thanks!

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Hi all,

i have an 2010 21,5” iMac with a faulty GPU.

I found a cheap GTX 260 from an Alienware Notebook.

I have put this GPU into my iMac, i hear the Startup-Sound, but i got only the first two LED’s light up. Is this normal, if the GPU doen’t have Apple Firmware on it ?

No screen anyway. I have tried High Sierra so far, but no luck. I will try El Capitan/Sierra.

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Any updates on this issue? Mine was fixed with new chips 3 times already, but I think a new card is the only proper solution . . . other than the GPU, the iMac is still running fine with its i7 and the later upgraded SSD. Would be a pity to waste it.

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The gpu chips are trash. I’m trying to find an alternative right now for my old 2009 24”. I got a pi 3 to attempt bios flashing on other cards. Work in progress. Still love this old machine

I swapped out my old GPU myself - to a 2TB. but not have, what I believe is an overheating issue - mac shuts off after 30 minutes or so.

took it to a 3rd party mac repair shop and they said looks like the logic board is damaged and there's nothing to do but trash it.

seems like a waste...

@joemullen You may have disturbed the now (since 2011) very crumbly heatsink paste on the CPU. You should try redoing the paste on that. Also you may not have applied the paste correctly to the GPU and pads to the VRAM on the GPU card. You could narrow this down using Macs Fan Control or iStat Menus to monitor the temp sensors and watch what sensor is rising above 80 degrees. Other possibilities are damaged heatsinks (I have seen pin holes in the copper pipes that have caused issues previously. Don't give up on it yet!

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Check this out. https://www.youtube.com/watch?v=HBxpFwKc...

Video card in late 2009 iMac still going strong after 2.5 years!

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Don't bake the video cards. It is a temporary fix AT BEST.

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I can confirm that HD 4850 from imac 2009 is compatible with imac 2011. I had the whole cooler so you dont need any disassembly just replace the whole gpu with cooler and it works

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That's a 27 inch 2009 iMac?

What model iMac 2011 do you have? I have been trying to get mine started with the HD4850 and High Sierra. It's a 12,2 iMac. The HD4850 I recieved came with the original cooler on it (2 copper pipes) and it fit once it was bent a little into the old cavity. Currently, I can only get the OS into safe mode where it does list the card correctly, but doesn't boot normally. It locks up once it engages driver/graphics acceleration (screen blinks) going into the normal OS boot process. Thanks!

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