I just won whatever this is. I know it's a Radeon AGP card, definitely one of the later ones, but the listing didn't say and the picture of the box didn't reveal it either. I suspect a 4670 based on preliminary Google searching. Going to throw this into the Win2k box for fun.
A followup on this one.
I received the box and unlike most of the boxes I've seen online, it didn't have the model number anywhere. On the card itself, there wasn't even a sticker. We had to hunt down the part number - it was in very tiny print elsewhere on the card itself. Turns out it is in fact the 4670 with 1GB. The card didn't even look used. Came with all packaging and manuals. I'm really pleased about this.
The card has a nifty little jumper that allows you to enable or disable the HDMI audio device. It's also fairly unique in that you get DVI, VGA, and HDMI all on the same card while still connected via AGP.
BlackWingCat's modified Win2k Radeon drivers (10.x) plus KB888111 made this card work perfectly.
Occasionally, when the computer starts up, the card will complain about the 4-pin power connector not being connected. I suspect that might be because of the small power supply that came with the case. I'm going to replace the existing 300W with a 450W and see how that changes things. For now, I just keep resetting until it boots. SFX power supplies aren't as plentiful as ATX ones. But this is what I get when I use a small case.
We've gone a little out of scope (originally this was supposed to be retro-capable but now it's kind of a monstrosity) but it's been fun.