Hey everyone,
I'm pretty new to PC gaming, been a console guy my whole life but have had experience with PCs as I am a software engineer and growing up I built a few computers with my dad.
So recently I bought a new PC. 
Original Specs:

• Ryzen 9 3900x
• Asus Prime 570x Pro
• Trident Royal DDR4 32GB 3200
• Seasonic Focus 850w
• RTX 2070 Super 2070 FTW3 Ultra

This set up ran flawlessly. Wasn't doing too intense gaming, mostly Fortnite and MW. But want a 3080 for Cyberpunk.
 
I then waited in line at Microcenter and was lucky enough to get a RTX 3080 FTW3 Ultra. I go home super excited and put it in. Run fortnite and its running terrible. Bunch of stutters, super choppy and then eventually crashes. Reboot a couple times and same thing happens, eventually I'm unable to boot up the computer with the 3080 in there. Try downclocking and undervolting, it runs better but always get the crash. Switch to the 2070 Super and it starts running flawlessly. All of this of course is with updates BIOS, ddu before installing the card and then clean installing the latest NVIDIA drivers.
 
So I know what you all are thinking at this point, its the seasonic focus, but I did not know at that time that it could be the PSU as I went to test it at micro center and it was running at capacity, so I RMA'd the card and got a replacement. So I install this new 3080 replacement card and downclock/undervolt it to 1875 Hz/925mV and it actually ran pretty well for around 50 minutes, much longer than the 5 minutes I was getting before. Hopes were high but then the inevitable, crash to a black screen and then I'm unable to reboot. So at around this time I found the thread on the PSU on this forum and I'm like oh, its definitely my power supply, the seasonic focus 850w can't handle the spikes that this card does. So I go to micro center this morning and just for ****s and giggles get a 1600w EVGA P2. Go home, ddu while using the 2070, install the 3080 and drivers and run it at stock, no changes to the clock or volts and it runs prettty good for around 10 minutes in Fortnite but once again the inevitable. A black screen crash. Was able to reboot however and am currently writing this.
 
So any clue what it could be? I'm at my wits end on this. Going to try the other 3080 now, since I haven't shipped it back to EVGA. Please help ;(

EDIT: nevermind, saw the 1600W one buried there.
 
 
There are some reports of the P-states bouncing around causing black screens. Supposedly going to be fixed in new drivers. I've not seen it though.

No I can't, I just heard from someone that referenced the Nvidia forums on this forum (without a link).

thats the power of amd

xPatriot12
Very helpful response there. So we can close this thread, it ended up being my motherboard, probably bad routing on the previous one. I do not recommend the asus prime x570 pro. Had to replace 2 of them in a 2 week period. Went with the MSI 570x Meg ace and it’s working flawlessly

Well congrats on the upgrades, sounds like you've got a pretty serious rig shaping up there.  May I recommend 3600 or 3800mhz ram with tight timings as your next upgrade.