How well does MacOS handle DRAM-less SSDs?

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MacBook Pro 13 "Unibody Late 2011

2011년 하반기 모델, A1278 / 2.4 GHz i5 또는 2.8GHz i7 프로세서.

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Nick @nick

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How well does MacOS handle DRAM-less SSDs?

My 2011 MBP is still rocking it’s OEM 500GB spinning hard drive since I’ve largely been tolerant of it because I haven’t been around SSDs a lot at the time I purchased it. The problem now is both of my E6220’s and my new production laptop have SSDs and the performance is disgusting to me now to the point I thought my HD cable was bad again when I padded it.

I have used the PNY CS900 with success in my first E6220 since it was sold as a No HD system and I’m seriously considering a 500GB version for my 2011 Pro. However, it runs like a DRAM-less SSD but unlike early ones, the performance penalty isn’t an issue. I am looking at getting a 500GB version of it for my MBP.

Does MacOS struggle with these DRAM-less SSDs? If it doesn’t, the PNY seems like the best drive to get. I already changed drive cables, so I’m SSD ready.

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Dan @danj

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DRAM-less SSD’s is like putting a souped up engine into your car with the cheapest transmission you could get!

I don’t recommend them in Mac systems.

The OS the given system has also plays a big role here. As an example the older HFS+ file system does massive moves unlike APFS when you copy a file or move it from location to location on the same volume. But, APFS is very chatty constantly moving markers, unlike HFS which doesn’t need this chattiness.

To add to this a SATA based SSD has only one set of write/read queues unlike a PCIe SSD which has a four per lane. So if the SSD needs to handle more APFS transactions the PCIe interface would be better. In the case of SATA SSD with a DRAM cache would off set some of the APFS transaction dialog and with HFS+ will help in its file moves.

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The savings of them is appealing when the penalty isn't as horrible as the early ones. It sounds like APFS relies on DRAM if the DRAM-less ones have issues. It has a minor penalty on the Windows side, which is why I tolerate it on that Dell. Maybe it works well in the Dells because it's a old Sandy Bridge machine and Windows doesn't really benefit from DRAM?

I'm still going to run High Sierra, but I'm going to make a boot USB to get around the APFS conversion so I can keep my APFS opt-out unless it's a genuine benefit with a SATA SSD. I don't use my optical drive, but I also don't know how I feel about removing it just in case someone needs it and mine is the only Mac with one.

Nick 의 2020년 1월 30일

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The savings of them is appealing when the penalty isn't as horrible as the early ones. It sounds like APFS relies on DRAM if the DRAM-less ones have issues. It has a minor penalty on the Windows side, which is why I tolerate it on that Dell. Maybe it works well in the Dells because it's a old Sandy Bridge machine and Windows doesn't really benefit from DRAM?

I'm still going to run High Sierra, but I'm going to make a boot USB to get around the APFS conversion so I can keep my APFS opt-out unless it's a genuine benefit with a SATA SSD. I don't use my optical drive, but I also don't know how I feel about removing it just in case someone needs it and mine is the only Mac with one. — Nick

MacBook Pro 13 "Unibody Late 2011

How well does MacOS handle DRAM-less SSDs?

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