Re: To GTX 280....or 4870....
Make sure that you use the 8.6 officials for it--not the hotfix or the 8.7 (which is for the X2). These are the best performing drivers out for the card at the moment.
You'll also want to refer to the fan fix in the "other graphics" section here, because the fan currently throttles down too low and causes the card to run hot. Fixing the fan speed will keep it idling nice and cool (~45-50C.)
i7-2700k @ 5.0 GHz
Nvidia GeForce 570 2.5GB Tri-SLI
Asus P67 WS Revolution (Tri-SLI)
OCZ Vertex SSD x 4 (Raid 5)
G.Skill 8GB DDR3 @ 1600MHz
PC Power & Cooling 950W PSU