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2019 iMac recognized memory with 2400 MHZ

A

amirali.saeedi

macrumors newbie
Original poster
Mar 27, 2019
11
2
Hi Folks,

I just got my new 2019 iMac received and setup. I got the base 8 GB RAM option and upgraded myself with Corsair Vengeance Performance Memory Kit 32GB DDR4 2666MHz. Upon first boot, I have noticed an issue. My iMac has recognized 40 GB of RAM. But the speed is shown 2400 MHz, instead of 2666 MHz. Additionally, the About window is missing the "Memory" Tab. Anybody knows what's wrong?
 

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I tried removing the Corsair RAM and the base 8 Gig jumped to 2666. I did some research and it seems there might be a latency mismatch here. The Corsair RAM is CL18, but the base one are CL19. Now I have ordered Crucial, which appears to be CL19 also. Hopefully, that resolves the issue for me.
 
amirali.saeedi said:
I tried removing the Corsair RAM and the base 8 Gig jumped to 2666. I did some research and it seems there might be a latency mismatch here. The Corsair RAM is CL18, but the base one are CL19. Now I have ordered Crucial, which appears to be CL19 also. Hopefully, that resolves the issue for me.
Click to expand...
Yeah I ordered the Crucial and have 40GB running at 2667 in System Report.
 
jonatious said:
https://smile.amazon.com/Timetec-PC4-21300-Unbuffered-Notebook-Computer/dp/B07H4YBTYY
Does this have any difference in performance other than it being from a non popular brand?
This seems to be $30 cheaper
Click to expand...

I would not say non popular since my 2019 iMac was preloaded with 8 Gb of likely the same RAM from Hynix :p I would still go with Crucial since people have seen consistent results. I tried the Corsair one first, but it is reducing the speed to 2400 instead of 2667. Hence returning it.
 
I'd like to know if I can add 2 sticks of 2400 MHz to my new I mac without hurting it. I can't afford to buy the 2667 MHz at this time. Someone gave me their 2400 out of their older I mac.
[doublepost=1565530977][/doublepost]I'd like to know if I can add 2 sticks of 2400 MHz to my new I mac without hurting it. I can't afford to buy the 2667 MHz at this time. Someone gave me their 2400 out of their older I mac.
 
mjy said:
I'd like to know if I can add 2 sticks of 2400 MHz to my new I mac without hurting it. I can't afford to buy the 2667 MHz at this time. Someone gave me their 2400 out of their older I mac.
[doublepost=1565530977][/doublepost]I'd like to know if I can add 2 sticks of 2400 MHz to my new I mac without hurting it. I can't afford to buy the 2667 MHz at this time. Someone gave me their 2400 out of their older I mac.
Click to expand...

It won't hurt it, they will just make all your RAM do 2400 MHz
 
Seems to me that although you might be able to use software to "measure the difference" between 2667 and 2400mhz, that difference in speed will be UNperceivable to the user "in the real world".

If someone "gave me" 2400mhz RAM, I'd leave it in there and run it that way for the life of the Mac, with a big smile !! ;)
 
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