i am goin to purchase an amd fx8350 with gigabyte 990x and and cooler master 350 cabinet with 16 gb of ram and ati radeon 7770 2gb crossfire,what amount of power supply shud i require?
80W * 2 = 160W + 125W CPU = 285W. Toss a bit more in for the board, ram, drives, etc and anything that can do 325W+ on the 12V rail(s) will be fine. Any good quality 500W PSU will handle this fine.
520W psu is recommended with 2x 6 pin connectors , at least.
HD 7770 needs one 6 pin power connector and draws up to 80W .
to be safer , get 600W psu. 600W will ease your future upgrades.
80W * 2 = 160W + 125W CPU = 285W. Toss a bit more in for the board, ram, drives, etc and anything that can do 325W+ on the 12V rail(s) will be fine. Any good quality 500W PSU will handle this fine.