This is my first post and i want to thank all of you in advance! I own a kind old rig which i decided to upgrade a bit since my graph card got busted(i had a 9800GTX+ on winXp): Now i went to Win7 64bit ultimate gigabyte m/b maximus formula E6850 core2duo 3 GB RAM 850W coolermaster PSU My first choice of card was NvidiA GT630 , 2GB ram. I could immedietelly see that something was wrong with my FPS on my games. They would not get as high as i expected (even on medium and low settings) and the worst of all was the choppy gameplay and stuttering. I had no temperature problem since i did monitor both my CPU and GPU and i have properly updated all my drivers.So i took the card back and took another one to try(same model). But alas i had the same result. I though it could be somekind of hardware/software incompadibility so i returned the second card and payed a little extra to get the GT640 ,2GB ram. Same result!! Choppy gameplay and FPS going up and down. I tried all this on many games(all kind of directX , 9 10 and 11-with the two last being slightly better in performance but still not acceptable. Now the weird thing was when i took a friend's card to test with. An Nvidia GTS250 ,1 GB ram. Everything was smooth and steady and i could enjoy all application and games, even on directX 10 with a really good FPS! So what could be possibly wrong with using the other cards?