Sapphire Radeon HD 7790 2GB OC Review @ OCC
 

After all the testing is done, the Sapphire HD 7790 2GB OC will offer up additional FPS performance when the settings are increased to take advantage of the larger frame buffer. Instances where running with a quartet of 4K monitors or when attempting to game at Eyefinity resolutions can provide some benefit over the 1GB-equipped cards. The most graphic example I saw in my testing of where the 2GB on this HD 7790 paid dividends was in the 3DMark Fire Extreme testing where this card proved without a doubt when the game settings are indeed high enough you do see a point of difference.

http://www.overclockersclub.com/revi...d_7790_2gb_oc/