Do I need more power for SLI?

lt13kformula

Honorable
Mar 4, 2013
25
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10,530
Upgraded my gpu to the GTX 660 TI 2Gb, going to run SLI on 2 of them. I have a Coolmax ZU-900B PSU (900W). Is that going to be enough power to run the SLI and all my other stuff too?