For a system using a single GeForce GTX 780 graphics card NVIDIA specifies a minimum of a 600 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 42 Amps or greater and that has at least one 6-pin and one 8-pin PCI Express supplementary power connectors.
Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Sufficient Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C - 50°C ambient temperature, is the most critical factor.
Overclocking of the CPU and/or GPU(s) may 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.
Antec 750W EarthWatts Green (EA-750 Green)
• OEM: Delta Electronics
• maximum combined +12 Volt continuous current rating of 62 Amps
• four (6+2)-pin PCI Express supplementary power connectors
• 80 PLUS BRONZE Efficiency Certification
• 3 Year Limited Warranty
Corsair TX750 (SKU # 75-001309 / CP-9020042)
• OEM: Chicony Power Technology
• maximum combined +12 Volt continuous current rating of 62 Amps
• four (6+2)-pin PCI Express supplementary power connectors
• 80 PLUS BRONZE Efficiency Certification
• 5 Year Limited Warranty
CoolerMaster Silent Pro M 600w (RS-600-AMBA-D3) Discontinued
• OEM: Enhance Electronics
• maximum combined +12 Volt continuous current rating of 40 Amps
• two (6+2)-pin PCI Express supplementary power connectors
• 80 PLUS BRONZE Efficiency Certification
• 5 Year Limited Warranty
Corsair TX650 (SKU # 75-001315 / CP-9020038)
• OEM: CWT (i.e. Channel Well Technology)
• maximum combined +12 Volt continuous current rating of 54 Amps
• two (6+2)-pin PCI Express supplementary power connectors
• 80 PLUS BRONZE Efficiency Certification
• 5 Year Limited Warranty
Corsair HX620w (CMPSU-620HX) Discontinued
• OEM: Seasonic
• maximum combined +12 Volt continuous current rating of 50 Amps
• two 6-pin PCI Express supplementary power connectors
• 80 PLUS STANDARD Efficiency Certification
• 5 Year Limited Warranty