I have a nvidia 7300GT graphics card. Occationally i will play a game like Need for Speed Carbon or AoEIII. Lately when i have been gaming i get some sort of wierd lag. The framerate will speed up a lot then pause and speed up again. When i first got my grpahics card it ran fine and then the problem just manifested itself even though i hadn't made any changed. I came to the conclusion that it must be a software problem so i formatted my computer (it's something i like to do 3 or 4 times a year since my PC gets easily 'clogged') and installed the game AoEIII but the problem seemed to have remained.