DRAM light on, ROG Strix z790-F gaming Wifi

[safe robin]

Bought a pc from cyberpower last week and has worked fine until today when this afternoon the screen froze and after turning the PC off and back on it wont post and the dram light is on. If I clear the cmos it posts and then when XMP is enabled it fails to post after, if disabled it boots but then my memory is not at its max speed.

CPU 14-900k
Mobo: rog strix z790-f gaming wifi
Memory DDR5 32GB 6400MHZ CORSAIR DOMINATOR TITANIUM RGB BLACK [CMP64GX5M2B6400C32]

[last bluff]

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[trail palm]

Change it to 6000Mhz

[safe robin]

The only options I get are 6400 and 6600, or am I supposed to change it in the DRAM Bios line

[trail palm]

DRAM Bios line, you can change it to any speed you want

[safe robin]

Crashed and froze mid way through trying to change it

Im guessing that means the ram is the problem and not the bios

It wont post now

[safe robin]

Confirmed one of the sticks has died as when i swap them round or just plug one in at a time it doesnt work for one of the sticks

Time to ask for them to send me a new 64 gb kit