Hi.I want to upgrade my GPU. I am using the Sapphire Radeon HD6570 1GB DDR3 HM. I want to buy a Radeon HD77XX.I found good deals for the ASUS Radeon HD7750 1GB DDR5 V2 and Sapphire Radeon HD7750 2GB DDR3 both of them for $60.My question is which card I should choose.My PSU sucks and that is why I can't to buy more powerful card. I just want a card that will support DX12 and be able to get 30FPS medium/high 1050p in the newest games. 
