Video Card Question

So, my neighbor is getting a new computer and is offering me his old one... I don't want his whole computer, because it is somehow worse than my clunker in all areas except the video card. His computer has a Radeon x1300 video card, which is I am ASSUMING is better than what I currently have in my PC, which is a Radeon 9550. (Laugh all you want, but I can play my UT04 and HL2 perfectly fine with it.)

Anyways, I'm wondering if I should pull the card out of his computer and stick it in mine... I know that neither of the cards are top end or anything, but I'm just wondering if I'll get better performance, or any at all, from the x1300.

Yeah, I can still get games like HL2 and Far Cry and Doom 3 to look nice, but my computer would explode with these newer games. But then again, I have no intention to play most, if any of them...

Can anyone help me? :( :P