I'm a n00b with graphic cards and I would like to know this... I currently have a Radeon X850 Pro graphics card, it's AGP. Is upgrading to Radeon X1650 Pro 512MB worth it? Is the card better overall than the X850? I've found some on eBay and they are dirt cheap, too cheap which is getting me wondering as to why they are? Are they worse than the X850's? Thanks.