It's really really bad when playing Assassin's creed Brotherhood or Call of duty 4.
My system is
i5 750 2.67ghz with stock cooler 4GB of ddr3 1333 noname brand GTX 680 EVGA superclocked Asus p7p55d-le Vertex 3 120gb connected in sata 2 power supply 600w noname brand Windows 8 64 bit pro (it doesn't have to do with that I'm sure of it)
Thank you all
More aboutweird issue game might
Was this happening before you upgraded your graphics card to a 680?