in BF2 when i play on the big 64 player maps i get lockups when i fly over the map in an aircraft. the screen turns to colorful vertical bars which foreces me to restart my computer. I jsut upgraded my graphics card, but i dont think thats the problem. I got a x800xt and it locked up, got a replacement and it did, but they were both refurbished so i figured that might be th e problem so i got an x850xt pe retail and now its doing it, although not in the smaller maps and in lesser 3d applications. I ran a memcheck program on restart and it detected no errors. I have a 1gb rosewill pc3200 stick. My PSU is a really cheap 450w that came with my case and only has 18amps on a single 12v rail so i'm thinking that might be it, but i'm not sure which it is.