I’m tearing my hair out trying to stabilize my daily memory OC on a Crosshair VIII Impact (X570). Curiously, I had zero issues running these same sticks with tight timings on my previous B550-F Strix, but this 2-dimm "overclocking" board is giving me a harder time.
I can barely get it stable at DOCP settings. Even for DOCP to pass, I have to manually drop ProcODT to 36.9Ω, or I get immediate errors.
Current Specs:
• CPU: 5800x3d
• RAM: GSKILL 3800C14D-32GTZN 2x16GB Dual-rank
• Motherboard: ASUS ROG Crosshair VIII Impact (X570)
• FCLK: 1900MHz
What I’ve attempted so far:
• Tested various RTT combinations (Nom/Wr/Park).
• Played with Drive Strengths (ClkDrvStr, AddrCmdDrvStr, etc.).
• Tinkered with ProcODT (36.9Ω seems to be the only "semi-stable" value).
• Adjusted VSOC, VDDP, and VDDG (CCD/IOD) voltages.
The Issue: I'm seeing multiple errors in TM5 and sometime black screen to reboot when I try to push past stock DOCP or tighten the subtimings that worked perfectly on my B550-F.
Is there a specific BIOS quirk or a hidden setting on the Impact that I’m missing? It feels like the signal integrity is worse here than on a mid-range daisy-chain board, which shouldn't be the case for a 2-dimm PCB.
Any advice on specific CAD Bus or RTT values that the Impact specifically "likes"