Hd 7850 or gtx 660 will be good.please tell your +12v amperage ratings on psu sticker.
Lovely thank you, I am not at home at the moment but I believe the +12V can be found here of my PSUhttp://www.bequiet.com/en/powersupply/293
Two separated 12V rails (DUAL RAIL) for optimal power supply
Stable power supply, high degree of safety against currency fluctuations off the power mains through a very high support time of >23ms.
Maximum power stability on the output voltages of (+/- 3%) and active PFC with PF of up to 0.99