It should be enough wattage but I would be more concerned about the amps on the +12v rail for SLI.
That unit has four 12 volt rails, you will need to make sure that each 760 is on it's own, dedicated +12v rail.
The only way to know for certain is to study the PSU wiring diagram.
This is why most people (including myself) opt for a PSU with one +12v rail when running SLI or Crossfire.
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