Edit: I just found out my PSU had a 6 pin + 2 pin pcie connector.
another question. how about HD 7850? can my PSU power it?
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More aboutimaster 500w 7770
Your link is broken, could you post it again so we can see the specifications? Generally speaking, however, I don't think you would run into too much issues. The Radeon HD7770 is a very power efficient card so I don't think you would have any troubles even if your PSU seems to be a no-name.
I would, however, recommend swapping it out for something more reliable such as a Corsair CX430V2 ASAP.