For a
system using a
single GeForce GTX 760 graphics card NVIDIA specifies a minimum of a 500 Watt or greater
system power supply that has
a maximum combined +12 Volt continuous current rating of 30 Amps or greater and that has at least
two 6-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.
The
Cooler Master Thunder 500W (RS-500-ACAB-M3) power supply unit, with its
maximum combined +12 Volt continuous current rating of 34 Amps and with
one 150W (6+2)-pin PCI Express supplementary power connector, is
sufficient to power your system configuration
with a single GeForce GTX 760 graphics card.
Since one 150W (6+2)-pin PCI Express supplementary power connector is able to supply the same amount of power as two 75W 6-pin PCI Express power connectors you can use a PCIe Y-splitter cable like the following:
http://www.newegg.com/Product/Product.aspx?Item=N82E16812198018