Just I bought Sapphire HD7770 Ghz Edition. Manufacturer suggest 450watt psu but I have 400watt psu. I set my graphic card to
pc. I can run pc well. I tested play games. Just Cause 2, Skyrim vsvs. I dont have any problems for now but I am afraid of encounter problems so I need help.
Your psu is just fine. HD 7770 can run on 350 watts psu. If you are worried about your psu try to get a quality psu brand like seasonic, corsair or antec. Don't get me wrong here.. your psu is okay unless you add more stuff on your pc or oc.