I have a ASUS Radeon HD 7790 card on a FX4100 Quad core 3.6 GHz but i want to upgrade my GPU but i don't know if i should get a second HD7790 as it comes with a crossfire bridge or a better card like a HD7850?
i wouldnt try anything with that psu. you'll need a quality one. as a single gpu i would choose 280x, 7850 will not give a great boost.if you cant afford it.