For basic card games, upgrading your video card probably won't do you any good. You are going to need a faster CPU, and some more RAM would be nice. If you have the budget for it, I would recommend upgrading your motherboard, CPU, and get some new RAM. If not, then the best you can do is try to find out what your motherboard supports, max out the RAM, and try to find the best CPU your board can handle on eBay. If your board is decent and supports at least a 333 FSB, then you can probably get an Athlon 3000+ for it over on eBay. If your FSB is limited to 266, then you are likely limited to the 2400+ and below.