Various slides about AMD Radeon HD 7900 series now has been leaked by OBR Hardware, let’s see the relative data firstly.
It appears that HD 7970 based on GCN architecture improves greatly in tessellation, with nearly an increase of 50% over HD 6970. And the games performance improvement is quite exaggerating as well.
According to some slides revealed by ZOL, HD 7970 will support PCI-Express 3.0 and Direct X 11.1.
The low power consumption is owing to 28nm manufacturing process, and idle power is below 3W, improving significantly.
Below are the slides exposed by DonanimHaber.
The same with HD 6900, HD 7900 series also feature dual-BIOS design.