Okay, I got the Gigabyte 660 GTX OC, but when I plug it into my monitor my monitor wont turn on. I don't have a dvi cable but I used a vga-dvi adapter to plug it in to my monitor. This is for a new system. The cords are securely connected and the psu cord is going to the PCI-E slot on my PSU.
Here's my setup:
PSU: Corsair 750W (gold)
MOBO: ASRock Z77 Extreme4
RAM: 8GB G.Skill 1600
HDD: 1 TB Western Digital 7200
GPU: GeForce 660 GTX OC
Here is a picture: http://imgur.com/cHfs0
.... Don't mind the messy cable management.