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You obviously need a quality ps in order to power just the video card much less the rest of the system. Also you need to plug the 6 pin sli power connector into the video card. You should be looking for an atx 2.x compliant ps with at least 450w with at least 30+ amps on the 12v rail. I would recommend enermax but any "quality" ps will do the job.
 
Good brands are Antec, Enermax, Fortron, Tagan, XClio...

1. Make sure it's ATX12V 2.01, so it has dual 12V rails, SATA connectors, PCIe 6-pin connector, 24-pin or 20+4-pin main connector...
2. The combined Amps on the 12V rails should be more than 26A (preferably 30+A)...
3. Don't shoot for anything lower than 350W, 400W or more is advisable...
4. If possible, look for a PSU that sports PFC, it will be more efficient with the power it gets and needs...

BTW Have fun gaming... 🙂
 
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