Yall thought I was a madman but after lots of FAFO and voltage adjustments, I have achieved success in stabilizing DDR5-8000 on a 4 DIMM motherboard, an ASRock X670E Steel Legend to be exact.
This project was boldly going nowhere until I found the EXACT sweet spot for VDDIO and RTT-WR. The timings are a hair loose, I just needed to rule some variables out.
One thing I fought early on was retrain inconsistency, where the same settings reboot to reboot would vary in stability. Setting the data bursts to 8X helped a lot with this, and it still only takes like ~15 seconds to train on my new Teamgroup Delta kit.
How I found the sweetspot for VDDIO was I starved the DIMMS of voltage, 1.5 VDD and 1.35 VDDQ. Then I put VDDIO at 1.43 and started testing in increments of 0.01v up and down. 1.43 to 1.4 would instantly spit errors out in TM5. 1.39 ran stable for 15ish mins so I decided to test lower. 1.35 would trigger auto system recovery, 1.37 was instant BSOD opening TM5. 1.39 is perfect though. I then returned VDD and VDDQ back up to 1.58 and 1.47 respectively.
As for RTT-WR, I found raising it helped a fair bit, defaulted to 40, initially I tested with 60 I believe, which ran about 45 minutes of VT3 before an error, dropping to 48 has got us 6 hours. I will be running Karhu later but so far really happy with these results.
Im hoping to drop WRRD, RRD, RTWR etc down a bit more, I belive like 8-8-32 FAW and like 6-16 WTR with 16-2 WRRD, plus 120ish ns tRFC probably, and 36-46-40-40-80 primaries.
Overall I really have to thank this community of wonderful people, and especially u/buildzoid because 6 months ago I didn't know anything about RAM overclocking.
One day I stumbled apon one of the "reacting to ram timings" videos, and I was instantly hooked. I spent the next month bingewatching all of the ram oc videos soaking up knowledge and trying things out, there's a lot of valuable information there. Thank you Buildzoid
Also someone suggested I run the XMRig benchmark, and I just got first place out of all the 7800X3D entries on there, by a margin of nearly 200 pts at 12757H/s
https://xmrig.com/benchmark/kqSGo
9 Comments
I admire your patience even more than I admire your achievement here. As much I would love to really dig into memory OC, I always get fed up before I actually get anywhere.
nicely done
Congrats! Nice achievement. Do you know the performance increase compared with say 6400Mhz ? In a game or 3dmark timespy or so ?
Sweetđź‘Ś
Thought it was Intel and I was very excited for a moment, but still pretty nuts to do it on AMD. Good stuff man.
They call me a MADMAN
Congrats! Can you explain again the “starving out of voltage” strategy pls?
Can you run a xmrig benchmark? Im very curious what happens when you push the IMC far beyond what should be possible.
Yeah? but can it run Crysis?