F5-6000J4048F24GX2-RS5K on Asus Prime X670-P not reaching rated speed

[nine_seven]

Hello,
I recently configured a new PC with GSkill Ripjaws S5 on an Asus Prime X670-P board. Originally I was aiming for Flare X5 memory due to the EXPO profile, but the 48GB kit was not available, so I got the Ripjaws kit with XMP on it.
The past days I tried to get it working at the advertised speed of DDR5-6000, but apart from a few times when I could boot to Windows, the BIOS refused to POST.
I tried with loading complete or Asus optimized XMP and also tried to loosen CL and WCL, but so far no success in getting it stable. I also tried to lower the speed to DDR5-5800 while keeping the XMP timings, also with no success.
Now I am wondering if this is all due to the XMP vs. EXPO issue or if I have a chance to still get the memory running at higher than default speed.
Note that this kit has Micron memory chips while my other PC uses Ripjaws S5 with Hynix memory chips and runs fine at DDR5-6000 with XMP enabled, while also being an AM5 System.

[GSKILL TECH]

Are you using the latest BIOS? The memory kit and motherboard is not a validated combination so it is possible the combination can not work well together especially at full speed.

[nine_seven]

Thank you for the reply.
Yes, I am using the latest BIOS, v1616, with support for 24/48GB RAM modules.
Do you think that running RAM with XMP on an AMD system could be one reason for bad compatibility?
Also, do you know of general issues of 24/48GB modules on AMD platforms?

[GSKILL TECH]

At this time, the memory kit is designed for Intel only so any use outside of that, and the G.Skill RAM Configurator / QVL, can not be expected to run full specifications.

[nine_seven]

Thank you. I was wondering if there was any difference between Ripjaws and Flare besides the Profiles and your post makes it clear that there are in fact differences.
Therefore, I will return the memory and get a Flare X5 Kit.

In case anyone is interested: I played a bit with the speeds and timings and found that DDR5-5600 was running stable @1.15V VDD and VDDQ with timings on auto. DDR5-5800 was bootable @1.2V VDD and VDDQ also with timings on auto, but I could not get it stable.
Interestingly, when raising VDD and VDDQ to anything above 1.2V the system would be more unstable than with 1.2V. I guess that this may be due to the Micron chips on the memory, but this is only a guess.

[nine_seven]

Hello,
just wanted to let you know: I finally got the Flare X5 memory (F5-6000J4048F24GX2-FX5) and it runs perfectly at the rated speed of DDR5-6000. I simply activated the EXPO and set UCLK=MEMCLK.