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Memory upgrade compatibility list for iMac 2019-2020

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The first post of this thread is a WikiPost and can be edited by anyone with the appropiate permissions. Your edits will be public.
pldelisle said:
As I said :



The correct, fully certified kit is CT2K16G4S266M . Up to you to chose it or not. Someone already tested CT16G4SFD8266 and it worked, so there is no problem. I don't know what is the difference between both modules. I prefer to take the certified kit. I don't see any reason not to take this certified kit over the generic kit.
Click to expand...


I searched and found this discussion :

imac 2020 27inch compatible ram - Apple Community

discussions.apple.com discussions.apple.com

" After a bit of research, I found out that the only difference between the 2 RAM models is the fact that CT16G4S266M has halogen and lead-free specs to comply with apple environmental standards. "
 
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zestUK said:
Hi wilberforce,

I returned my Timetec ram already, hence I would not be able to test it, would you mind to run a quick test on novabench and share with us the ram speed result of 16gbx2(crucial) + 16gbx2 (timetec) in A + A +B +B configuration and A + B + A + B as well please? Much appreciated.

the link below has my report on ram speed.
forums.macrumors.com

Memory upgrade compatibility list for iMac 2019-2020

Hi All, After reading as many posts regarding iMac 2020 ram upgrade as I can. I would like to share my little finding here. My mac is 3rd tier one. come with 2 x4gb Hynix ram. 1, I tested 2x16gb timetec kit. it works without mixing up with apple ram. once mix up with apple one. clock speed...
forums.macrumors.com forums.macrumors.com
Click to expand...
Yes, I already did this. This is for the i7 processor:
slot 1 16GB crucial
slot 2 16GB timetec
slot 3 16GB crucial
slot 4 16GB timetec
gives 2133 MHz, Geekbench 8240 :(

slot 1 16GB crucial
slot 2 16GB crucial
slot 3 16GB timetec
slot 4 16GB timetec
gives 2667 MHz, Geekbench 9001 :)

See my other recent posts for discussion
 
wilberforce said:
Yes, I already did this. This is for the i7 processor:
slot 1 16GB crucial
slot 2 16GB timetec
slot 3 16GB crucial
slot 4 16GB timetec
gives 2133 MHz, Geekbench 8240 :(

slot 1 16GB crucial
slot 2 16GB crucial
slot 3 16GB timetec
slot 4 16GB timetec
gives 2667 MHz, Geekbench 9001 :)

See my other recent posts for discussion
Click to expand...

If you put the timetec first, does it make a difference?
 
zestUK said:
Hi wilberforce,

I returned my Timetec ram already, hence I would not be able to test it, would you mind to run a quick test on novabench and share with us the ram speed result of 16gbx2(crucial) + 16gbx2 (timetec) in A + A +B +B configuration and A + B + A + B as well please? Much appreciated.

the link below has my report on ram speed.
forums.macrumors.com

Memory upgrade compatibility list for iMac 2019-2020

Hi All, After reading as many posts regarding iMac 2020 ram upgrade as I can. I would like to share my little finding here. My mac is 3rd tier one. come with 2 x4gb Hynix ram. 1, I tested 2x16gb timetec kit. it works without mixing up with apple ram. once mix up with apple one. clock speed...
forums.macrumors.com forums.macrumors.com
Click to expand...
Try this again: adding the Novabench RAM speeds, as you requested (these are the maximums of 3 tests on each arrangement):

slot 1 16GB crucial
slot 2 16GB timetec
slot 3 16GB crucial
slot 4 16GB timetec
gives 2133 MHz, Geekbench 8240, Novabench RAM speed 25660 MB/s :(

slot 1 16GB crucial
slot 2 16GB crucial
slot 3 16GB timetec
slot 4 16GB timetec
gives 2667 MHz, Geekbench 9001 Novabench RAM speed 29600 MB/s :)

slot 1 empty
slot 2 16GB crucial
slot 3 empty
slot 4 16GB crucial
gives 2667 MHz, Geekbench 8930 Novabench RAM speed 29100 MB/s :)

hope that helps
 
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wavesm said:
If you put the timetec first, does it make a difference?
Click to expand...
I just tried it again both ways, and it makes no difference (considering that there is some small random variation in score from test to test, I tried 3 tests on each arrangement). I cannot tell any preference of Timetec vs Crucial, they seem to be pretty much the same.
 
pldelisle said:
Crucial will be more reliable, pretty sure.
Click to expand...
I 100% agree. Hence I am keeping the Crucial and returning the Timetec. But in terms of benchmark scores and RAM speed, I can't discern any significant difference. Thanks for pointing that out, it is an important consideration when selecting brand, as Crucial costs a little more than Timetec.
 
wilberforce said:
This should be a very interesting test. You not only have the same manufacturer of ram chips, but the same size, too. Most people here have mixed sizes (unsuccessfully).
However, some have found just a later batch of the same 3rd party RAM can be not (fully) compatible.
Click to expand...
Just to cover my bases in both threads, as Wilberforce suggested, the with the crucial 16gb sticks in slots 1&2, and the 16GB apple stock ram (made by Micron, not hynex) in slots 3&4, I appear to have retained both speed and dual channel. hazaaa.
 
pldelisle said:
As I said :



The correct, fully certified kit is CT2K16G4S266M . Up to you to chose it or not. Someone already tested CT16G4SFD8266 and it worked, so there is no problem. I don't know what is the difference between both modules. I prefer to take the certified kit. I don't see any reason not to take this certified kit over the generic kit.
Click to expand...
Ok fair enough, i have ordered the CT2K16G4S266M kit. And i will post the test.
I have a question.. The Geekbench score with 32GB Ram is around 8900/9000 but it seems that 64GB Ram doesnt really crank up the score...Is that normal? is 9000 the maximum what we will get from the i7 with 5500XT ?

Greetz,
 
AppleLover87 said:
Ok fair enough, i have ordered the CT2K16G4S266M kit. And i will post the test.
I have a question.. The Geekbench score with 32GB Ram is around 8900/9000 but it seems that 64GB Ram doesnt really crank up the score...Is that normal? is 9000 the maximum what we will get from the i7 with 5500XT ?

Greetz,
Click to expand...
I think. I never seen anything above this with this configuration. Anyway it's just benchmarks... very little representative of real life usage.
 
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AppleLover87 said:
Ok fair enough, i have ordered the CT2K16G4S266M kit. And i will post the test.
I have a question.. The Geekbench score with 32GB Ram is around 8900/9000 but it seems that 64GB Ram doesnt really crank up the score...Is that normal? is 9000 the maximum what we will get from the i7 with 5500XT ?

Greetz,
Click to expand...
The only results I have seen near 10,000 are with the i9 processor
 
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RyanXM said:
I have 2666, 2933, and 3200 here and waiting for my 10-core build to arrive. I will be testing all three speeds to see if they will run at their max speed. All Kingston HyperX Gaming RAM. 128GB of each speed.
Click to expand...
Has anyone tried 2933 RAM yet to see if it is compatible and/or will run at the full speed, since the i7 and i9 support it? There may be a logic/motherboard limitation, though.
 
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AndySpeed said:
Has anyone tried 2933 RAM yet to see if it is compatible and/or will run at the full speed, since the i7 and i9 support it? There may be a logic/motherboard limitation, though.
Click to expand...

I read in some review that it doesn't matter what speed you put in, it only runs at 2666Mhz. The reviewer tried 2933 and 3200. That is why I bought HyperX 2666. Because it was cheaper and on sale, and spending more for faster RAM would have been pointless.
 
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ZBoater said:
I read in some review that it doesn't matter what speed you put in, it only runs at 2666Mhz. The reviewer tried 2933 and 3200. That is why I bought HyperX 2666. Because it was cheaper and on sale, and spending more for faster RAM would have been pointless.
Click to expand...

What are your Geekbench scores? I have the HyperX and have pretty high Geekbench scores compared to what I've seen. I think the lower CL might make a difference.
 
tyk said:
What are your Geekbench scores? I have the HyperX and have pretty high Geekbench scores compared to what I've seen. I think the lower CL might make a difference.
Click to expand...

‘My iMac is in Japan. Won’t get it until next week. I have four shiny new HyperX chips on my desk looking sad...
 
ZBoater said:
‘My iMac is in Japan. Won’t get it until next week. I have four shiny new HyperX chips on my desk looking sad...
Click to expand...

I started with 2x32 HyperX as an experiment and was 10,200 with i9. Added another 2x32GB and 10,300. Haven't seen anything higher on Geekbench, outside of Windows / Hackintosh. Very curious what you get.
 
Hi Peepz


This is the result with the Crucial CT2K16G4S266M kit 2x16GB.



E4CE96C7-817F-42F0-B294-5001D63A17B6.jpeg
IMG_4790.jpg




Its a keeper for me ;)
Soon I will buy the same kit to make it 64GB total.


Greetz,
 
So.... Purchased from an online store, the samsung 2x32gb. Has someone experienced getting the ram just in the bubblewrap envelope, in the box? No plastic container 🧐 Should be brand new.
 
I have a RAM question.

Is it better to get a single 32 gig stick (so I have the option of later on adding another one if it seems it's needed), or two 16 gig sticks?
 
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