@Warlord any luck with the cards so far?
I can report 1:1 fail and success.
For the FX5800/FX2000 with the problems shown above I tried 3 times to cruedly reflow. Final go I really hit with the heat and now it won't post. If it was an actual FX5800 I'd recap etc but for now RIP
Victim #2- TI4600 with this issue:
Tried Shamino's trick kind of and what do you know putting pressure on or around the bottom memory pad not only changed the artifact colour but after a reboot temporarily made it disappear.
Sadly this behavior was short lived first showing a new artifact as below then going back to the same artifact and no pressure later on would change it.
At least there was hope that it was fixible. Took off the heatsink, note to all Ti4600/4400 FX5800/FX5950 users... your TIM pad is basically like dried gum by now and needs replacing. The heat gun and a scraping device was needed to remove it.
Preheated the board with the heatgun moving around the core, then made sure to raise the temp to the point solder melted on top of the core (my temperature test) just a bit + 10secs more heat for good luck. Let it cool for 30 mins at least.
What do you know Ti4600 working happily and all games working fine! Of course no idea how long it will last.
Having experienced the temporary reprieve described earlier and combined with the fact that the artifact is a uniform 1/4 ish of the screen tells me this was VRAM related. However, my guess is that the actual root issue is the cooler, as the TIM dries the core dumps more heat on the PCB (you can really feel the difference by putting your finger on the board behind the core before and after) warping the PCB it as it cools, heats and repeat with use.
Over time some issue between the core and the VRAM chip occurs, in this case maybe a corresponding solder ball at the peripheral of the GPU chip (not sure if pressing around the VRAM would influence this or not). By cruedly reflowing the GPU and fixing the cooler issue it seem this one can live on a bit longer.
Sorry for the essay, wanted to share in case it helps others. 👍