Hi friends this is my first post! my 600w psu burn last mornig i want to buy new one So which psu should i use? 600w or 650w? and what about corsair vs? my cpu is Amd fx8320 n Gpu is HD 7770! and why psu burn? by over load?
What country are you in so we can check availability? What is your budget for the PSU? What are the complete system specs? Are you thinking of adding another GPU in crossfire in the future?
The HD 7770 only requires a 500W PSU. Which PSU works best for your system depends on your components and what upgrade options you want. The Seasonic S12II series are high quality for a low price. The SeaSonic S12II 520 Bronze would easily power your system as-is and the SeaSonic S12II 620 Bronze would allow for another GPU in crossfire. If you're looking for a modular PSU then you can move up to the SeaSonic M12II 520 Bronze or SeaSonic M12II 620 Bronze.
There are a lot of quality PSUs available with up to 80+ platinum efficiency ratings. We need to know a little more information before we can make more suggestions.
No, the VS series is not very good. You don't need to be looking at very high wattage PSUs, like I said, 450 would easily be enough - the 7770 doesn't draw much power.