My computer detects my 660ti but it does not detect my 7970, i did OC this for a little bit before i crashed, now it can't detect it at all, any help would be greatly appreciated!!
500W (or greater) power supply with one 150W 8-pin and one 75W 6-pin PCI Express power connector recommended8
850W power supply (or greater) with two 150W 8-pin and two 75W 6-pin PCI Express power connectors recommended for AMD CrossFire™ technology.
Certified power supplies are recommended. Refer to http://ati.amd.com/certifiedPSU for a list of Certified products
Are you using the PCI-E 8 pin connector or some adapter kludge ?