Agreed with a previous post suggesting that a single card is the better way to go it is. Lower power consumption, lower heat, more stable performance. If you have enough to go with two 760's you are better off just buying a single 780. In which case a 550 Watt PSU of quality would do the trick.
What PSU model do you have? decent 650W will be plenty for your requirements!
But if you SLI then get 2GB versions 4GB useless in SLI!
And for CPU it won't bottleneck two 760 in SLI
600-650W is your range for a Single GTX760. If you're thinking of doing SLI, don't bother with the GTX 760, head straigh to a 770 or GTX 780 (of course this is, if you're gaming 1080p or higher)
Agreed with a previous post suggesting that a single card is the better way to go it is. Lower power consumption, lower heat, more stable performance. If you have enough to go with two 760's you are better off just buying a single 780. In which case a 550 Watt PSU of quality would do the trick.
If you use PCPartPicker.com and put a GTX 760 in a build you can actually see how much power it uses. Depending on CPU choice, you could actually get away with something below 500W, but having more is always a good idea.