Optimze the RAM-Speed - how?

[Gooly]

Hi,
I added two of the same RAM to my PC:


The test finished without any errors

Ok, the mem-test is one target, but I would like as well test the max RAM-Frequence at which this pc is save.

If I set in the Bios Auto the RAM-Frequence is set to 3600MHz.

Now, before this test I changed in the Bios to the predefined setup of Asus from Auto to DOCP 1 which sets a Mem-Frequence of 6400MHz:



But the test seems to run with 3600MT/s (see above)?

In the log I read: Supported timing at highest clock speed (2400 MHz) : 40-40-40-77
In the ptx-file I can read:
ModuleManuf: Corsair
ModulePartNo: CMK96GX5M2B6400C32
RAMType: PC5-51200 DDR5 XMP 6400MT/s
RAMTiming: 32-40-40-84

Thanks in advance
Gooly

[David (PassMark)]

What version of Memtest86 were you using?

[Gooly]

Version:
Major: 11
Minor: 5
Build: 1000
Architecture: 64

[David (PassMark)]

This is the latest release. So the 3600MT/s value is probably correct as displayed.

These are the specs for your Ryzen CPU.

Max Memory Speed
2x1R - DDR5-5600
2x2R - DDR5-5600
4x1R - DDR5-3600
4x2R - DDR5-3600

Note how your CPU can only run at 3600 when 4 RAM sticks are in use. You need to go back to 2 sticks to get to 5600. The 1R / 2R refers to the number of ranks.

The CPU's Integrated Memory Controller (IMC) gets stressed with 4 sticks, facing more electrical load, signal reflections, and timing challenges with extra modules and longer wires, forcing lower speeds and looser timings for stability.

It can be complex but 2x2R is likely optimal.

[Gooly]

Ahh - I understand, thank you very much and a successful 2026