This is my 6200mhz cl28 full stable config. ( the key was to increase the procodt pu 48 and pd 60 without this no stability. i dont know why?)

But no matter what i cant stabilize 6400mhz with the same timings.

I think im not limited by vsoc because i can boot with 6600mhz 1:1 with 1.30

What i tried for 6400mhz cl28

vdd: 1.56

vddq 1.56

Vsoc 1.28, 1.30.

I always get error 2 in testmem 5 extreme anta777

Sometimes i can go with hours without errors but sometimes only 40 min.

Maybe need to change the resistances?