Got myself that xfx merc 6950xt and its crashing to a static type screen as soon as I go into gameplay from game menus. AC odessy crash straight away, Jedi survivor managed 5 mins. Tried all the usual stuff and temps look absolutley fine. Pretty sure Rams fine, and have disabled all stuff in bios that various places recommend, and update driver/chipsets and tried older drivers! Absolutley fine on bench marks and stress tests as well, so just when in proper 3d game. Downclocking/ reducing/ increasing power and gpu frequency does nothing to help.
Either I've been sold a dud, or was thinking my 850w psu might not be man enough... Although if it was the psu id expect the computer to restart/shutdown, not go to a static screen where can hear audio in background?
Anyone know if a crash to a static screen indicates a certain type of issue? Man, I'm sooo bored of AMD cards not working out the box.
It could very well be a dud of a card however, lets explore a few other options first. Unless faulty that PSU should be fine. Your GPU shouldn't draw more than 340-360 top balls to the walls. Considering you have already tried a fresh install of windows I would look elsewhere unless it's not a real fresh install, if its just a restore and not a proper "delete partition and start from scratch" kind of thing, then I would give that a try. You will be surprise how much BS windows keeps around even after a restore.
I would go to the maker of your motherboard and get the latest BIOS, get it even if its the same as your current, load defaults, save, and then update the bios no matter what version your running. Report back. I would stay away from undervolting until the card has been deemed stable, if you want to reduce temps stick to under clocking the core instead. 2200-2300 max core clock should stick it around 210-220 watts of max output.
If you have the time you could also try out Linux for a quick test. Get EndeavourOS. Installation is very straight forward. Once up and running here, open Konsole(command prompts equivalent) and type without quotation "yay -S steam". Follow the prompts. When asked about some libraries choose 4 which should be the radv-vulkan library and then 4 again to choose the lib32 version of radv-vulkan. Let it complete and find steam in the start menu and login. The rest is as you already know. See if a game will crash while playing.
I recently had issues with the pc freezing after fullscreen exit and it turned out that my bios was messed up. But i've had this issue in different variations multiple times now ever since I bought my first b450 gigabyte board. Like once every 6 or so months. Also a lot of the websites of a google search(the blog looking kind) regarding how to fix anything from crashes, stuttering, blackscreens and freezes and absolutely garbage tier advice. Stay away from them. It's the same copy paste answers on every single one of them.