Thanks for the response. I'll try your suggestions, as soon as I get a chance.
XMP profile at 3200 MHz should be fine with the 9900K. And the CPU overclock of 4.7 GHz should be stable, and has been for the last 19 months I have used the system.
The system does not crash. Audio still plays. It's just the fans ramping up and the GPU delivering no more output until I restart. I'm not sure if it's only the GPU fans or all fans. I'll check it later.
i9-9900K @ 4.7 GHz
CPU Cooler: Noctua NH-D15
Gigabyte Z390 Aorus Pro Wifi
2x Corsair Vengeance LPX 16GB @ 3200
PSU: Corsair RM1000x 80+ Gold
EVGA RTX 2080 Super Black Gaming
Case: Corsair Carbide 200R
Ok if audio still plays, it may be gpu related. Are you able to alt+f4 the game? I have experience crashes with my 9700k @5ghz that would only affect the GPU driver and maybe also display at some point. Haven't really paid much attention to it. Only thing was it helped upping the vcore. Also your OC might be unstable after a while.. My OC have gone "bad" severel times, changing with windows versions, bios etc. So keep that in mind. I would personally just backup my OC settings and try default to try replicating the issue