Hi there! I'm new to this forum and I'm a begginer OC enthusiast.
I recently built my new PC and today I swapped very good RAM sticks to even better ones, but could not run them at full rated speed in coupled mode (Infinity Fabric 2000MHz):
G.SKILL F4-3600C14D-32GTZN -> 3600MHz CL14-15-15-35 1.45V
G.SKILL F4-4000C14D-32GTZN -> 4000MHz CL14-15-15-35 1.55V
My problem is:
I cannot run stable and without WHEA error my new RAM at full speed (4000MHz CL14) when in coupled mode (Infinity Fabric set to 2000MHz).
After first run, XMP on, all auto, it set itself to 4000MHz CL14, but Infinity Fabric only to 1800MHz, which have worked flawlessly with my old RAM sticks (which were 3600MHz CL14), but wasn't coupled with my new sticks.
I tried all speeds coupled and came to 3733MHz - 5 minute OCCT burn, no WHEA errors.
3800MHz - 5 minute OCCT burn, also no error, but... 2T rate, strange CL rating (CL15), very strange subtimings. I also read somewhere that 1900MHz/3800MHz became problematic on F33 BIOS. I also read somewhere that Ryzen CPUs don't like even speeds (like 3800, 4000 etc.), they prefer odd speeds (3733, 3866 etc.).
Maybe I should change some voltages?
There is a CPU memory controller voltage? Increase, how much?
Maybe trying to lower RAM voltage (I read somewhere that it helped in other case someone)?
Maybe can you link me some good stuff to read about OCing RAM?
My setup is:
CPU: Ryzen 5950X @ stock
CPU cooler: Kraken X73 @ top exhaust, Thermal Grizzly Kryonaut Extreme paste
GPU: RTX 3090 TUF OC @ MSI Afterburner auto OC custom curve, 1920MHz core max, +200MHz memory, +7% power limit, V3 BIOS
RAM: 2x16GB 3733MHz CL14-15-13-29 @ 1,44V (G.SKILL F4-4000C14D-32GTZN)
Mobo: X570 Aorus Master v1.2 @ F34 BIOS
SDD (main): WD SN850 2TB PCIe 4.0
SSD (storage): RAID 0 -> 2x XPG SX8200 Pro 2TB, SM2262ENG controller, PCIe 3.0
PSU: BeQuiet Dark Power Pro 12 1200W
Other: Sound Blaster AE-9
Case: Phanteks P500A with 3 front intake, 1 rear exhaust 140mm fans
OS: Windows 10 Pro 64-bit
My OC experience is:
-Core 2 Duo E4300 1.86GHz @ 3.0GHz
-Phenom II X4 945 3.0GHz @ 3.3-3.5GHz
-i5 4690K 3,5GHz @ 4,3GHz
-other is not worth saying, but I know a bit about GPU OC and RAM OC, but only basic stuff, never were much into it.