So recently, while playing Black Ops 3 zombies i've had some issues. Most pertaining to graphics drivers failing, like nvlddmkm failing. However I found these crashes slightly odd, since they will randomly turn both monitors into a rainbow artifacted mess, and I either have to power down the pc myself to restart, or wait a few minutes and it will do it itself. Audio throughout these crashes usually plays on for a minute before cutting off. I tried to move to black ops 4 zombies, same issue. I figured it might just be a terribly bad optimized game issue until it happened in world of warcraft of all games, a game that's barely taxing on the system at all. I have a 2080s and a liquid custom loop, temps have never once been an issue. I've done just about everything in the book, DDU, reinstall drivers, full format of drive and reinstallation of windows, different display port cables, reseating the GPU and riser card its on, testing ram, resetting all clock speeds and voltages back to default (although I never did any serious overclocking to any of my components,) nothing has worked for me.
 
This has led me to believe it must be a hardware issue with either the PSU or the GPU, but the interesting thing is I really can't replicate this crash on my own. The only time I have ever been successful in recreating the crash has been while running OCCT's VRAM test, where almost five seconds in the exact same rainbow graphical crash happened.
 
I can usually play cod zombies until my second monitor starts to flicker, as in it will go black for a second or two then come back, and that usually tells me its about to crash. I have once seen a strange red artifacting going horizontally across the second monitor when this happened, but only once. Sometimes that monitor also stays off for upwards of a full minute before coming back, but nothing wrong with the main monitor. I have also swapped cables around, and it is still always on the second monitor. I'm not sure what to do, and I'm very close to just doing away with the RMA process for my 2080s, but I wanted to know if anybody else had any ideas like it being the PSU failing.
 
I do have an 850w Seasonic Focus, which I figure should be enough for my system, though I guess I could be wrong. If anybody could help that would be fantastic. 
 

 
Operating System
Windows 10 Pro 64-bit
 
CPU
AMD Ryzen 9 3900X 48 °C
Matisse 7nm Technology
 
RAM
32.0GB Dual-Channel Unknown @ 1064MHz (15-15-15-36)
Motherboard
 
ASUSTeK COMPUTER INC. PRIME X570-PRO (AM4) 38 °C
 
Graphics
Dell AW2720HF (1920x1080@240Hz)
MSI MAG272QR (2560x1440@165Hz)
4095MB NVIDIA GeForce RTX 2080 SUPER (EVGA) 35 °C
 
Storage
931GB Samsung SSD 970 EVO 1TB (M.2 (SSD))

My guess would be the GPU, if it was the psu you'd likely experience issues outside of just graphical artifacting. You would also most likely face random system shutdowns. If I was a betting man it would be your GPU no doubt. Do you have an extra card to test? Maybe get a cheapo card just to make sure.

That looks to be the video card ram corruption or the monitor going bad .
( possibly a bad cable between the card & monitor also )   - RMA both , if possible and get a new cable just in case

Thanks for the suggestions boys, I really do appreciate the replies. Seeing how I'll be leaving the US for a few months around the start of November, I think for now I will follow through with the RMA process and get that taken care of while I am gone. I'll be glad to come back and update this post when I have received the replacement card though, just for anyone curious as to if that's the issue or anyone who may find this later on in the future.

Again thank you all so much!

So you can’t get the issue to happen when running the occt vram test with a single monitor only?

Sadistsatisfied
At this point I have sent the card in for RMA and purchased a new riser cable, so I guess we'll see what the results yield with (possibly) new card and riser cable.

Looking forward to your results. 

Hmm. They replaced the pcb? So they printed out a new serial number sticker or just used your old one?