01-07-2025 03:31 PM - edited 01-07-2025 03:37 PM
I recently bought ram (F5-6400J3239F48GX2-TZ5RS) for my X670e-e Gaming wifi motherboard. Unfortunately, even though the QV list listed this not only as tested, but it would run at the rated speed of 6400mhz. It did not run at 6400 or even 6000 on any of the DOCP profiles.. And it's not my CPU having the problem since I've had other really risky ram kits that ran surprisingly well overclocked. There's also a white version of this on there that probably is also incorrect. And yes I had the most recent bios update. I just put in 64gb CL30 instead and it runs fine at 6000mhz. In fact my CPU has hit the lottery so well I can do 4 dimm 64gb at 6000mhz (obviously I don't make that my main setup because 4 dimm is unnecessary). Not sure how this even ended up in the compatibility list in the first place, just overall really unstable and a waste of ram I had to return due to this problem. Wouldn't even run below the run speed.
01-08-2025 12:12 AM - edited 01-08-2025 12:15 AM
Hi @slavicpsycho
You can read here as this clears up some common misconceptions regarding memory overclocking. Unfortunately, the "these work so this should work" ethos isn't all that applicable to memory OC.
1. 6400 1:1 UCLK requires a reasonable CPU, especially in that density. Moreover, the QVL isn't meant to provide assurances. With overclocking, such things aren't possible. While the QVL kit is listed, achieving stability at the rated speed is not guaranteed for every combination of CPU and other hardware. Of course in an ideal world, all kits would work under all conditions - but this would make the world of overclocking a much less interesting place.
2. The QVL offers guidance to provide the best possible chance of success. The validation process is done on a specific set of hardware to show that stability is achievable. Due to part to part variance not all configurations will achieve the same results, as is the nature of overclocking. Unfortunately, due to the nature of AM5 and running asynchronously with the Infinity Fabric, the lines become quite murky regarding what the platform can and can't do depending on the configuration you're attempting to run.
3. Comparing other densities at different speeds is apples to oranges due to the differences in sub-timings, frequency and the increased memory density resulting in more signal cross-talk and noise presenting additional challenges with more capacity on a single module.
4. This memory kit was originally binned by the memory vendor for Intel-based platforms. Different electrical impedance characteristics and platform capabilities may mean, in some cases, the memory vendor's voltage guardband may not be sufficient in all cases when used on a different platform. This is why motherboard vendors expose all the necessary settings to help combat such things - as manual tuning is always a possibility, especially on more aggressive kits.
As a starting point, you can try:
01-13-2025 03:29 AM
I understand that the QVL is not guaranteed speeds, but the fact I couldn't even come close to 6000 with this kit despite the QV listing 6400mhz running speed is odd I will admit. I did try all those suggestions and further than that but was unable to get this kit working above stock. I unfortunately had to make a return & get EXPO ram instead, but I'll make sure to avoid the motherboard QVL next time and go off user experiences online instead. I'm comfortably running 64gb at 6000mhz on my 9950x now. Thanks!
01-13-2025 04:27 AM
Are you using a CPU contact frame?
4 weeks ago
No, just the mount that came with my liquid freezer AIO.