Quote
Power requirement 500W(with two 6-pin external power connectors)
taken from: http://www.gigabyte.com/products/product-page.aspx?pid=4795#sp. 
Topic: Gigabyte 270x on a 400w Dynex PSU? (Read 2030 times)
I actually think you're just shy of what you'd need. You can feel free to ask around or wait to see if anyone with any first-hand experience can help you, but according to Gigabyte's website it says you need 500w.
the Dynex is practically brand new (sitting my my garage still sealed) so there's been no degradation at all, but not sure if it's capable of running a gigabyte 270x with Core2Duo CPU 2GB ram and BAMT
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