XMP isn't applicable to 4x sticks. Can it sometimes work? Yes. But if you were "stable" prior to running XMP /w 4 sticks of DDR5, you probably actually were not and the new bios is bringing out the instability more. Also 2x32 or 2x48 is dual rank, wh...
There is still a chance that it is CPU instability. 6400 should be very very easy on 16x2 with just about any Z790 and a 13900K. I would set prime95 aside for now. Do this. Download Benchmate and run CB15 Extreme 5-10 times on stock settings. Cineben...
It "might". Have you tested it yet? I mean 8400 XMP probably isn't going to happen, who knows though I have seen stranger things lol. If I missed it, why LLC6?
You don't really want to increase AC_LL (stock is 0.55 for the 14900K) UNLESS you're tunin...
I am curious on your thoughts on something. I have been reading over at HWLuxx, and Veii suggests not touching DC_LL (I think he calls it telemetry faking), and actually increasing AC_LL over stock and then tuning VF Curve to undervolt. I believe the...