X670E Taichi - 192GB ram with 9950X

reset all settings and set in bios:

dram freq: 5200 or 5400 or 5600

dram timings: all auto
DFE Read Training = Enabled
Gear Down Mode = Enabled

Once stability is found, you can turn these back to Enabled:
Memory Context Restore = Disabled
Power Down Mode = Disabled

voltages:

VDDIO = VDD = VDDQ = 1.2 or 1.25 or 1.3 or 1.35
VSOC = 1.25
VDDP = auto
VDDG CCD/IOD = auto
VDD Misc = auto

Infinity Fabric = 2000
UCLK = MEMCLK

bus configuration:

ProcOdt = 48
ProcCaDs = 30
ProcDqDs = 34.3
DramDQDs = 34 or 40

RTT_NOM_RD = 5
RTT_NOM_WR = 4
RTT_WR = 2
RTT_PARK = 4
DQS_RTT_PARK = 5
or
RTT_NOM_RD = 4
RTT_NOM_WR = 4
RTT_WR = 2
RTT_PARK = 5
DQS_RTT_PARK = 5
or
RTT_NOM_RD = 5
RTT_NOM_WR = 5
RTT_WR = 2
RTT_PARK = 5
DQS_RTT_PARK = 6

Also try RTT_WR = 1

go to AMD-->CBS-->DDR Options-->DDR Training Options and set:

RX2D_TrainOpt = manual
TX2D_TrainOpt = manual
TX DFE Taps = 1 taps
RX2D voltage step size (2^n) = 1
TX2D voltage step size (2^n) = 1
RX DFE Taps = 1 taps

Try ProcOdt 60 or 120 if you not POST with 48 om

naeq wrote: Hello, My system: Ryzen 9 9950X AsRock X670E Taichi I have two kits of Corsair 2x48gb 6600MHz CL32 (CMK96GX5M2B6600C32) (192gb in four sticks). With bios 3.06 motherboard didn't even boot (Error code: EC), but with new bios 3.08 (with AGESA 1.2.0.2) I have successfully booted with 192gb of ram. The problem is, everything works with XMP and 3600Mhz or 3800MHz, but anything higher does not pass ram training. I have tried changing the impedance, like here: https://www.reddit.com/r/Amd/comments/159xoao/stable_128gb4x32gb_ddr56000_cl30_on_agesa_1007b/ https://youtu.be/NtMIppL9UC4 but nothing works. Is there anything i can do?

Hello!

I have the same motherboard & CPU as you do.
I went with 2x32GB DDR5-6000 CL30 RAM kit.
However, I had to lower the DRAM frequency to 5800MT/s, as with 6000MT/s I had some errors in MemTest86.

When running 4x48GB DIMMs, it's a lot of stress that you put on the memory controller. The official supported speed in that case is 3600MT/s.
You won't be able to go much higher than that!

So, it's a trade between density & speed.
You can't have both!

I'd suggest using only 2 DIMMs, which will be faster & better in most situation.