Nice and solid board but I also have trouble with the D.O.C.P. settings with an installed 3990X. If I try to apply them, boot will fail. After testing a lot different settings it was clear that the settings for DRAM AB/CD voltage cannot be changed if the 3990X is installed. Even 1.21v will fail.
Is there any solution for this?
The best settings I have found to get the G.Skill F4-3600C16Q-32GTZNC running are loading the D.O.C.P. settings and edit the following:
DRAM CAS# Latency --> 18 (16 will fail, 17 will apply to 18)
Trcdrd --> 19
Trcdwr --> 19
DRAM RAS# PRE Time --> 19
DRAM RAS# ACT Time --> 39
DRAM AB Voltage --> Auto
DRAM CD Voltage --> Auto
Even if the ram will require 1.35v it is stable with these settings. Tested so far 10 hours rendering with 2x Blender 2.79 (64 threads each) and AIDA 64 stress test 16h and 3 days of normal usage without any trouble.
Aida 64 Memory Benchmark results with theses settings:
Read 95,617 MB/s
Write 94,469 MB/s
Copy 94,652 MB/s