Crossfire 2 GTX 660 TI's

It's SLI but yes that is adequate, you may need to consider monitor resolutions in the equation though.

what is the brand of your pSU, if its antec,corsair,hec etc.. it should be able to handle those cards without any problem

750W is more than enough power, as long as it's a good brand. Please list the make/ model, or a link to a model page.

If you don't believe me put the specs into this.
http://www.extreme.outervision.com/psucalculatorlite.js...

For a system using two GeForce GTX 660 Ti graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 650 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 38 Amps or greater and that has at least four 6-pin PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C - 50°C ambient temperature, is the most important factor.

Overclocking of the CPU and/or GPU(s) will require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.

What is the brand and model number of your 750 Watt power supply unit?

Yes that Corsair is a quality unit and should have no issues with the SLI setup (not CrossfireX) of yours.

If you post all the specs I'll list what current you need, I have the pro version.
http://www.extreme.outervision.com/psucalculatorlite.js...

OC'd 660Ti's can be run in SLi on a decent 620w PSU and that includes 5 HDD's and 3 case fans and an i7 2600k @4.2ghz.

Yeah, but how many bunnies died ?
      :

Oh millions, every day!  

Im using a Corsair 80 plus bronze 750W PSU

Then you'll be fine and can run two 660 Ti's in SLI no problem.

The Corsair CX750 or TX750, with its maximum combined +12 Volt continuous current rating of 62 Amps and with four (6+2)-pin PCI Express supplementary power connectors, is way more than sufficient to power your system configuration with two GeForce GTX 660 Ti graphics cards in 2-way SLI mode.