According to sources, AMD decided it was time to return the Radeon HD 7970 the title of the fastest single GPU graphics cards. Fortunately, the advantage of NVIDIA GeForce GTX 680 is small, so AMD though that a slight increase in core frequency will restore the lead of Radeon HD 7970.
As you might know frequency of the basic Radeon HD 7970 is 925 MHz. In this case new model will receive a postscript GHz Edition in the title, as its core will be working at 1 GHz.
Some AMD partners have delivered versions of Radeon HD 7970 operating at high frequency. According to the manufacturer, the opportunity to make a higher standard frequency became possible because of improvement of products produced by TSMC. As stated, currently the majority of GPU's, AMD received from the contract manufacturer are stable at 1250 MHz, which is a pretty astonishing number.
Recall, the title of "GHz Edition" has already been added to AMD: Radeon HD 7770 GHz Edition and Radeon HD 7870 GHz Edition.