260 gtx power supply question

dx237

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Mar 27, 2010
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I recently purchased a 260 GTX to replace my 8800 gts, And I was wondering if I can use it with current power supply. It says it requires a 500w psu "with a 12v current rating of 36A". I currently have a HIPER 680 watt power supply, it says it has 4 +12V rails and i'm not sure what this means. Under output it says "+12V1@18A,+12V2@18A,
+12V3@18A,+12V4@18A". How do I find out my total 12v amps? Since the gtx 260 has 2 pci-e power connectors does that mean 18+18? or do I add all these numbers up?