Looks like that 285 I picked up is going to need a lot of TLC. It worked the first time I booted up XP, using normal VGA driver. After installing the 340.52 drivers, I was just getting black screens. Tried it in a different motherboard and I can't get anything out of it at all. Opened it up and found this.
It's not even close to the worst dust build-up I've seen, but I don't think I've ever seen rust on a component before. Thermal paste is easy enough to replace, but I don't know if I trust those thermal pads. I might have some left over from when I re-padded my PS4 last year. They seem to be 1mm pads, unless anyone knows for certain. I don't know if I want to try to clean it up or just return it.