Memory upgrade compatibility list for iMac 2019-2020

[Kb4791]

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.

I searched and found this discussion :

imac 2020 27inch compatible ram - Apple Community

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. "

 

[pldelisle]

I searched and found this discussion :

imac 2020 27inch compatible ram - Apple Community

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. "

Thanks for sharing !

 

[creativityrules]

FYI, Amazon is selling 2X 32GB kit for $239.99 as part of the "deal of the day"!

CT2K32G4SFD8266

Just ordered this kit so I can install it on my iMac when I get one.

 

[wilberforce]

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.

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

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

 

[wavesm]

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

If you put the timetec first, does it make a difference?

 

[wilberforce]

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.

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

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

 

[wilberforce]

If you put the timetec first, does it make a difference?

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]

I cannot tell any preference of Timetec vs Crucial, they seem to be pretty much the same.

Crucial will be more reliable, pretty sure.

 

[wilberforce]

Crucial will be more reliable, pretty sure.

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.

 

[anthony13]

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.

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.

 

[AppleLover87]

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.

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,

 

[pldelisle]

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,

I think. I never seen anything above this with this configuration. Anyway it's just benchmarks... very little representative of real life usage.

 

[wilberforce]

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,

The only results I have seen near 10,000 are with the i9 processor

 

[AndySpeed]

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.

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.

 

[ZBoater]

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.

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.

 

[tyk]

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.

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.

 

[ZBoater]

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.

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

 

[tyk]

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

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.

 

[AppleLover87]

Hi Peepz


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

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


Greetz,

 

[LadyNinja]

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.

 

[pldelisle]

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.

Should always come in a sealed box.

 

[pldelisle]

Hi Peepz


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



View attachment 948245 View attachment 948246



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


Greetz,

Black PCB ?! That's neat.

 

[AppleLover87]

View attachment 948245

Black PCB ?! That's neat.

no thats the original ram that came with the Imac ?

 

[pldelisle]

View attachment 948245

no thats the original ram that came with the Imac ?

Ok ! I was surprised too that Crucial gives black PCB

 

[iemcj]

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?