I currently have an Intel 960 sitting on a sabortooth mobo with 6 GB of ram. the cpu die is a 1366. my pci-e is 16x with a total of 3 slots. please help.
As a result, you should be able to use any gfx card that your budget can afford. Right now, the best bang for the buck is the new Maxwell-equipped GTX 970 and 980. I would recommend the 970 for that processor... if you can find one. They are selling out as fast as they arrive.