I would save the extra $$ and get the 2gb 7850, you wont regret it. you will regret getting a 1gb 7850, 1gb not enough now, you will be running games on medium detail to keep the vram useage down. Once vram useage goes over the 1gb mark, it flows to system ram, causing low performance and stuttering because it has to load back and forward between system and vram. Having said that the 7770 is really on the slow side to be able to use 2gb vram, it wont handle high settings anyway. So i think neither is a good choice, spend a few extra $$.