Thermaltake Toughpower XT 775W Vs Corsair HX1000W

For a system using two GeForce GTX 680 graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 750 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 53 Amps or greater and that has at least four 6-pin PCI Express supplementary power connectors or two 6-pin and two 8-pin PCI Express supplementary power connectors depending on brand and model of the graphics card.

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 @ 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.

The Toughpower XT 775W (TPX-775M), with its maximum combined +12 Volt continuous current rating of 64 Amps and with two 6-pin and two (6+2)-pin PCI Express supplementary power connectors, is more than sufficient to power your system configuration with two GeForce GTX 680 graphics cards in 2-way SLI mode.

The Corsair Professional Series HX1000 (SKU# CMPSU-1000HX), with its maximum combined +12 Volt continuous current rating of 80 Amps and with two 6-pin and four (6+2)-pin PCI Express supplementary power connectors, is way more than sufficient to power your system configuration with two GeForce GTX 680 graphics cards in 2-way SLI mode.

No need to get a 1000W psu for 2 680s and personally I prefer Corsair over Thermaltake. You'll be fine with a good 750W psu. Recommendations:

Corsair TX750 V2
Corsair HX750
SeaSonic M12II 750
SeaSonic X750
Corsair TX850 V2
Corsair HX850
SeaSonic M12II 850
SeaSonic X850
XFX Pro Series 850W

Dear EzioAs,
These supplies that you mention are not available in our country as far as I search 

Any other to help me