Hi i have an ATI Radeon HD 2600 PRO and i want to upgrade to a Nvidia Geforce gtx 680. But my computer only have PCI-E 2.0. And there is one more. I have an 200 watt psu. I think i must have like 600 watt or sometinhg. But can i run a Nvidia Geforce gtx 680 on a PCI-E 2.0?