Was wondering how much of a performace loss i would have if i put a gtx 570 in a pci-e x16 slot that was not 2.0. i have heard that most cards dont fully utilize the 2.0 speed anyways. Any thoughts would be appreciated.
1-2% max loss. Basically it will work fine.
As long as it is 2.1 or 3.0 you will be fine. If it is a 1.0 then I would worrie.