Hello. My specs are :
intel core i3 3210
2 GB Ram
Motherboard : ECS H61H2-M10 v 1.0(ECS Web Site > H61H2-M2 (V1.0))
I think 6 pin power connector is needed for HD 7770. My current PSU - beetel Bt-450 Do not has 6 pin power connector, it is noisy too.