Just to state my situtaion
Have a Giabyte 4090 since Jan 2023, Was running smooth untill November last year.
First error is with FC24, with DX error, DEVICE-HUNG. Did any thing you can find online, finally down the GPU clock speed by -200mhz fix the issue.
At that time only FC24 have issue. but as time goes, more and more games start to crash. Usaully with UE and DX12.
So i have to downclock my GPU more and more, now it can only run games like FC25, Black Myth, PUBG etc, if i downclock the GPU by -900mhz. which is just crazy.
I 've thinking it was a 13-14 gen CPU thing, change a new CPU, not working, limit the CPU votage to 1.3, not working.
Changed the RAM, not working, tested many nvida drives, not working.
And because looks lilke my situtaiton is getting worse overtime, (from -200mhz to -800mhz), i think it might be a GPU thing, planning to sent the GPU to Gigabyte see if it is a GPU memory thing(i heard that might be the issue)