Do you think this PSU is good?

Seasonic has a reputation for high quality power supplies. Seasonic is an actual manufacturer and makes some of the high quality Corsair and PC Power & Cooling psu's. Corsair and PCP&C do not make their own psu's.

Here are some links to actual technical reviews and test results for the Seasonic S12 series of psu's:

http://enthusiast.hardocp.com/article.html?art=MTM2NCwxLCxoZW50aHVzaWFzdA==

http://www.techaddicts.net/reviews/s12ii500/s12ii500.html

http://www.anandtech.com/casecoolingpsus/showdoc.aspx?i=3096

http://aphnetworks.com/reports/seasonic_m12ii_500w

http://www.silentpcreview.com/article226-page1.html

baskinghobo - If you are positive you need a 500 watt power supply for your system, then why are you asking about 430 watt power supply?

helloworld_98 - we have no idea what baskinghobo needs simply because the pc components, configuration, and games played were not listed. It is difficult to render an opinion when the information is missing.
 

theAnimal

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That is a very good PSU and easily enough power for your system.