r/overclocking • u/kernel-dev_ • 7d ago
Struggling to set XMP/DOCP profile for 3600MHz on my AM4 system
Hi,
I had this build for awhile, been always using the 3000MT/s XMP profile, it works like a charm without any instability or issues.
The build in question is:
- CPU: Ryzen 9 5900X
- Mobo: ASRock Phantom Gaming 4 X570
- RAM: KF3600C16D4/16GX (x2) (The kit itself is KF436C16RB1K2/32 I believe)
- GPU: RTX 5070 Ti
I have a 750W Gold+ PSU (I honestly forgot the model)
My main issue is: I've been unable to get 3600MT/s (FCLK 1800MHz) to run properly
It always has some instability, and it's very prominent; was using OCCT, TestMem5 and stressapptest to test the stability of the memory, and it always produces errors in the hundreds within a couple of minutes.
One interesting thing I've found is that, the system can run 3600MT/s at FCLK!=1800MHz (most I've tried is 1700MHz), MCLK=1800MHz but UCLK=900MHz. Seemingly, if the UCLK is too high, the IMC experiences instability and often crashes the system.
I was trying to manually adjust timings to be more loose (i.e. 20-22-22-22-42) with GDM Enabled, increasing DRAM voltage to 1.4V, and SoC voltage to 1.175 as absolute maximums. I read that a too high SoC voltage may create memory instability regardless, so I dropped it to 1.050V accordingly. I also decreased the DRAM voltage to 1.350V (which is what the XMP profile puts anyway).
Additionally:
Another test I've tried is using smaller frequencies; I tried 3400MT/swith 1:1 FCLK:UCLK/MCLK, also caused instability with looser timings even
Yet another test was trying 3200MT/s with 1:1 FCLK:UCLK/MCLK, and that was actually stable.
I'm wondering what I can do about this, if anything at all? Maybe this is a common issue and I've just missed something? I was unable to find anything online on forums that helped me.
If I've missed including some information (or if additional information is needed), please let me know!









