Seasonic S12G 650w vs Thermaltake Toughpower 750w

clutchc

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For a single card, either PSU would be fine.
For 2 x 250W (TDP) R9-280X, the 650W would be a bit light when maxed out.
For 2 x 120W (TDP) GTX 960, either would be fine.
http://www.hwcompare.com/18417/geforce-gtx-960-vs-radeon-r9-280x/

R9-280 =< GTX 960 < R9-280X