The Doom 4 has a good connection with the HD 7970

John Carmack announced on Twitter that Doom 4 will support the Partially Resident Textures (PRT) implementation, hardware virtual texturing.

Megatexture was developed by id Software. The procedure summarizes the textures on a given track and saves it in a file, so the program does not calculate the parts on that track separately. The entire terrain is a sizable texture so no fitting errors and repetitions are visible. Based on AMD's next-generation GCN architecture, graphics cards significantly accelerate the process through hardware virtual texturing. The official Demo based on this, the maximum size of uncompressed textures can reach 32 terabytes, taking image quality to a new level.

Source: Twitter