I had it working with DOCP settings - but windows would throw "random" errors and time out (haven't had time to trouble shoot) I have read there are settings in windows to change for thread ripper but I haven't played with them yet I just have a fresh install on my system

8x8
-G.SKILL TridentZ DDR4 3200 (PC4 25600) F4-3200C16D

Mikan02 wrote:
Hi.
Is this one 64GB kit or two 32GB kits? Asking cause you wrote kits and two kits can be more difficult to get stable even at rated speeds.
If two high speed kits matches and start without issues you are usually just lucky.

Have you tried to just enable D.O.C.P without any adjustments to speed, timings or voltage? 🙂

It's actually 4 kits of 16GB, it was the cheapest option when I initially bought them surprisingly. Worst case, how much more likely do you think a single kit of 64GB work be anyway? To be be even more detailed, one kit is a 4133Mhz kit, was running that at 3600-3800 on my old Z270 Setup, then got another kit, but of 3600Mhz, when I decided to go HEDT.

I'm about to go through this thread and try the various things, I'll post again with my results

IM3CPO wrote:
One other tip I have had suggested when populating all DIMM slots is to use manual settings (not DOCP), enter all memory timings manually, set voltage on RAM to 1.35v, and up voltage on SOC to 1.25v - 1.35v. Also set Memory Command rate to T2.. Good luck!

Thanks for the info, one thing I'm unfamiliar with on this new CPU is there are two DRAM voltages. One says AB Voltage, the other says CD Voltage? Do I match them? Mess with one and leave the other?



EDIT: I've tried the DOCP method and that failed to boot. Well, it kind of booted, but then Windows would fail to launch.

I tried manual settings with 1.25 SOC and it booted but eventually started to run into Windows errors and game crashes. I'll try higher SOC voltage.
I've been so unlucky with RAM speed on all the AMD systems I've worked on lately.

Enad1 wrote:
Thanks for the info, one thing I'm unfamiliar with on this new CPU is there are two DRAM voltages. One says AB Voltage, the other says CD Voltage? Do I match them? Mess with one and leave the other?

I dont know for certain, but my understanding is the AB is referring to the A and B memory channels and CD is referring to the C and D memory channels. You are supposed to use matched sets when using dual channel memory settings. Since the Threadripper is Quad channel, you get both AB (which should match) and CD (which should also match). Again, I am fairly certain this is the case, but I am not 100% certain.

In summary, you should set the voltage at whatever voltage your memory supports.