Power delivery is where I’d start
Pink blocks and static are somewhat indicative of faulty vram but you’ve got some bad power situations going on
Underpowered psu is obviously no good though 750W should barely cover a 9070+9900(unless you have like 80 hard drives or some crazy water cooling radiator or something). 850-1000 would give you more headspace for sure. 10yrs of use especially in high heat can drop transient voltage rating because capacitors age so the 750w might be more like 650-700w and that could be your issue there. Depending on the settings TW would totally push things so this could be it
Verify temps
After that eliminate the splitter - creates resistance and adds voltage drop/instability
After that driver issue - clean install
Quick checks for hardware fault - test in another machine if possible, see if artifacts show up in bios settings screen, run a gpu stress test like furmark and see if artifacting shows up very fast (though if you still have power delivery issues these might all fail so keep that in mind)
After that I’m out of ideas. Cable?


