Oh boy, kind of amazed that this has worked out, but I picked up a Radeon X850 XT AGP a while back and just kind of forgot about it because I'm so used to Radeons from this era being damaged from neglect, failed components or overheating. I didn't pay a lot for it and it was fairly dusty... I figured it'd just end up in the "to fix" box with a dozen other Radeons from the mid 2000s.
I decided to at least throw it into my tester PC for 30 seconds to see if it would even display the BIOS properly and it actually did! I didn't want to run it too long without knowing what the state of the thermal paste was, so I dismantled the whole thing, deep cleaned the heatsink and fan shroud, dismantled the fan and replaced both the bearings, cleaned all the thermal pads for the RAM and applied some Thermalright TF7 to the core... and... holy smokes, it works!
As I type this it just finished a full pass of 3dmark2001SE. It scored 16231 on my old trusty Athlon XP 1700+@2Ghz under Windows XP. Not sure how accurate it is, but Rivatuner says the core temp tops out in the high 50C range and the fan doesn't even really spin up much above idle. The sound is a bit obnoxious just because of the type of motor it is (and the side panel is open with the system on the desk in front of me) but with the fresh bearings it probably is the same sound it had originally. This is, after all, most similar to the 5800 Ultra's dustbuster type cooler since it pulls air from inside the case, through the heatsink and shoots it out the back.
After cleaning it up, it looks nearly brand new. I wasn't planning on doing this today, but I'm glad I did. What a beast of a card. 😁
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BTW, I think the hardest part of the whole process was carefully peeling the crusty old paper backing off of the black ATi sticker without tearing a hole in it, cutting strips of double sided tape to reattach it without it looking like a mess and applying a white circle of paper behind the ATi logo so that it wouldn't look all nasty and transparent. I think it came out pretty well. A little lumpy, but it absolutely had to come off so I think this was an acceptable result. 😀
(...and I know it looks a bit crooked... that red rectangle on a black circle is cursed to ALWAYS look crooked on that funky shaped heatsink. It may just be an illusion. Yeah... That's it. I tried three times to align it and that was the best I could do. 🤣 )