i got my card on sale it was cheaper than a regular 7970 . it is factory clo ked to 1100mhz GHz edition. and max clock u can get is 1150 i believe..... if i remember right... the asus regular 7970 is clocked to 1000mhz and the OC version is 1075mhz.
Just to clear something up, because I might have confused you a little bit. I did some research and I found that the asus cards were not oc friendly, and gigabyte/sapphire were recommended over the asus. As you see from what I've said... the cap is 1150mhz, but it does make a difference