The new AGESA version from AMD has changed a lot for Ryzen systems that have implemented it. I am running UEFI rev. 2.34 on my X370 Taichi, and the new memory straps are . . . interesting indeed.
I *almost* have DDR4-3600 stable as a daily driver. All I did was use the UEFI's XMP system to implement the DIMM's XMP settings (Corsair Vengeance LPX DDR4-3733 CAS/CL17) and set the strap to DDR4-3600. Then I set vDIMM to 1.4v and SoC voltage to 1.175v. I also manually set CR to 2T but it doesn't seem to do anything . . . performance is the same with 1T and 2T, and all the monitoring software is still reading 1T so, I dunno. I didn't gain any stability from changing the setting either (that I can tell).
I set ProcODT to 60 ohm.
Right now it's stable using these settings (DDR4-3600 18-19-19-39; Ryzen automatically sets CAS/CL to 18 here) and I'm getting over 53 GB/s read and 69.5ns latency according to AIDA64.
Sadly it isn't yet 100% stable since it crashes in certain workloads like y-cruncher and SuperPi Blend.
Ultimately I'd like to get DDR4-3733 or higher, but at this rate, it looks unlikely, at least using this particular UEFI revision. Any hints on what else I should be tweaking to gain memory clock?
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