i have an ati 5730m gb, i7, 8gb ram, lenovo y560

anyway all games was runnig great on win7 until i decided to upgrade my windows to win8

when i open a game it works great for only 20-30 min then it starts to lag

i have the latest driver ( 12-10 ) and everything is uptodate 

i searched microsoft forum and found something and i wont expect that lenovo gonna help me b/c they dont support win 8

so hope some1 help me ...

 sorry for ma english