It's not that simple, though. He might be stuck.
His card is at least 10 years old. That means his computer probably is, too. Nothing available NOW is really going to work so well on something from back THEN, if you see what I mean.
So he might be able to find an AGP 4x card, but he's going to be limited to about a Radeon 9550 or so. AH doesn't run so well on that.
I had to find a replacement card for my sister's older PC, and she was limited to 4x AGP, and the best readily available card I could find was the 9550. There might be others, but nothing very modern.