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모델 A1419 / Late 2013 / 3.2 & 3.4 GHz Core i5 또는 3.5 GHz Core i7 프로세서, ID iMac14,2

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iMac running slow with SSD and HDD

Hi All,

I am new to this forum but I cant seem to come right with my issue. I have done a fair bit of research but cant seem to come right.

My Issue:

I have two 27” iMacs, A Late 2013 and a Late 2012 model, both have the same issue. I installed an SSD into the iMac and did a clean OS High Sierra install but the machine “runs slow” if I can put it like that. Anything from opening applications to watching a video takes a while and just seems sluggish. The late 2013 iMac had surge damage but I replaced the power supply and installed an SSD. The Late 2012 model I replaced the HDD for an SSD. After both machines were opened and had the HDD replaced I ran into this issue. I have also tried booting up on an external SSD but have the exact same issue which rules out the SATA cables. I have also remove the SSD from the iMac and used it to boot up on a different machine and it works fine. I am currently just trying to sort out the late 2013 model at this point. I am busy installing Mojave to see if it will make any difference at all but I doubt it as the SSD works perfectly booting externally on a different machine.

Any help would be appreciated here. Its just strange that I have had 2 iMacs at different times with the same issue but I have done SSD upgrades to numerous machines over the years and have had no problems at all.

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What was the SSD you installed the 2.5" SATA drive or the blade PCIe drive?

If you swapped out the HDD for the SSD did you use the in-line thermal sensor these systems require?

Was these systems Fusion Drive models? If so did you break the fusion drive set?

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Yes it is a 2.5" SATA drive. I did not use the in-line thermal sensor with the Late 2013 model but did on the 2012 model. I have downloaded a fan speed control program for now but wanted to make sure everything is working fine before I buy one. No it is not the model that comes with the fusion drive. It came with a standard 1TB 3.5" drive.

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Have you checked the Activity Monitor to see if any processes are making the CPU too busy? Set it to All Processes, and sort by CPU%.

There is no real need to pay for fan control software as these folk issue one free, which works very well: https://exirion.net/ssdfanctrl/

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Guy - Be careful!

Fan control software is like pain management with Opioids! It feels fine at the start .... But, in the long haul you're damaging your self and your system.

You really need to know whats the cause and fix it than just band-aiding the symptom. In this case the system is in CPU Safe Mode. Newer Intel chips have this function when the systems management system is encountering sensor issues.

I rarely use it! And when I do its for a short window during a heavy processing job not all of the time.

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I was pointing out that it's not compulsory to pay for fan control software (referring to Michael Kilner's comment "before I buy one"). I made no comment on its use.

Like you, I would never propose to use the fan speed control software as a band-aid where the fans are running high due to a fault (which is happening on my MacBook Air 2013 due to liquid damage, for example). Though Mr Rossmann has some interesting chatter on the matter, where he mentions that the fans can go into overdrive for issues not connected with temperature—and the CPU runs slow: see https://vimeo.com/album/5751487/video/31...

I use SSD Fan Control—set to Smart mode so the temperature is being monitored and fan speed altered as necessary—after replacing an HDD with an SSD.

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OK, then I think we have to go into the systems preferences and make sure the new drive is selected as the startup drive within Startup Disk.

You may want to use this app instead TG Pro as it will show you more details on whats happening with the thermal sensors and fans. If you get the full version the other SMC sensors are also monitored. I personally like this program better than the others.

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I have checked that the SSD drive is selected as the startup disk but did not make any difference to the boot time or speed of the iMac in general. Just a question, could the power supply cause any issues with the speed of the iMac as I had to replace it before I wanted to upgrade the iMac to an SSD drive?

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Lets install TG Pro here so we get a handle on the thermal sensors. Post a snapshot of the main window, you may need to stretch it a bit so all of the sensors and the fans are visible. Adding images to an existing question

I would also run the onboard diagnostics restart the system and press the D key. Did you get an error message?

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If I do a Apple systems diagnostic it says it is picking up an issue with the SMC but does not give any further details

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Bing Go! SMC is set in Safe Mode. We need the TG Pro output to see if its one of the thermal sensors. It maybe one of the voltage sensors which will require the full version to see. Did you get an error code? If so what was it.

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Will get the full version and will send a screen shot of it. I will check regarding the error code as I did write the info down somewhere. I see if I check Activity Monitor and list system processes then a process "Kernel_Task" CPU% is around 250%

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