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