Find one with decent quality at 400W will do the trick as well. Has to be a quality one though. I suspect when you are down to that wattage, you will find a lot of poor PSU that can't handle the load they are said to handle.
I would get this. Above average quality at a great price
970 requires 2x6pin connectors and can consume 150 to 180 watts while gaming. Your not going to want to go too cheap on a powersupply ($50 to $70 is a good range price range for a respectable power-supply).
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