14900k + DDR5 6800mhz (XMP) = fail !?

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14900k + DDR5 6800mhz (XMP) = fail !?

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I got a 14900k in RMA, I only have blue screens, black screens, blocking in the bios. When I disable XMP 1/2 of my Gskill z5 6800mhz (4x16GB) and they are by default, the system seems more or less stable. If I enable XMP it crashes. For memory at 6800mhz working in 2133mhz has an impact on the performance of the cpu (computer). I used them on my 12900k and 13900k and they worked in XMP 1/2 at 6800mhz. How to get the 6800mhz manually knowing that the result will be the same with always a ram vcore at 1.40 (I tested 1.4100, 1.41500). I really have trouble understanding. My motherboard is: Asus Strix z790-a DDR5. Thank you

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