D3Ddebug and app crash

Hi everyone, I dont know if I am at the right place to ask my question but here it is… I am new to unreal and just buy a brand new Pc . Intel I9 13900k, RTX 4080 and so on. I have an issue called D3d Debug or GPU crash . and a black screen is seen and then my app crashes and got a messaged called Dx12RHI error etc… I looked online and it seems for some of you that changing DX 12 to 11 worked but for me is another thing. Once I changed it , i cannot open my viewport anymore or only move my mouse in it that my screen keep going pitch black on and off and then a message DX11RHi error is seen.
I reached Epic support and they asked me to ask people here . So is there anybody who could help me plz :S i have phots of my error codes and a video showing the app crashing while doing what i mentioned earlier.

I recently have samiliar issue, seems 13900k + 4090 is a bad combination some how. But I kinda found a work around, goto th Intel website and download “Extreme Tuning Ulitily”, then set p-core and e-core down a little bit, and the crashes and blue screens never showed again.