When it was released last December, the Radeon HD 7970 was the fastest single-GPU video card available on the market. However, the GeForce GTX 680, released in April, proved to be faster. To counter the faster GPU from NVIDIA, AMD first dropped the price of the Radeon HD 7970, and now is releasing a second version of the Radeon HD 7970, dubbed “GHz Edition,” with higher clock rates. Was the increase of the clock rates enough to take the crown away from the GeForce GTX 680? Let’s check it out.