Power Supply for AMD Athlon II X4

For a system using a single GeForce GTX 670 graphics card NVIDIA specifies a minimum of a 500 Watt or greater 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!!! 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 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 you are trying to achieve.

You may find power supplies on the market that supply more than enough Wattage to run the system. However, some of them lack Sufficient Amperage capacity on the critical +12 Volt rail, which is necessary to properly power the critical components in the system (i.e. CPU and GPUs). This is the reason why graphics card manufacturers may overstate the power supply wattage, usually by at least 50 Watts, in an attempt to take into account some of those power supplies that have the weaker +12 Volt rail(s).

What is your power supply budget amount?
 

Amazon doesn't say what the SKU# is.

The Corsair Builder Series CX600 V2 ( SKU# CP-9020048 / 75-001668 ), with its maximum combined +12 Volt continuous current rating of 46 Amps and with two (6+2)-pin PCI Express supplementary power connectors, is more than sufficient to power your system configuration with a single GeForce GTX 670 graphics card.

The now discontinued Corsair Builder Series CX600 V2 ( SKU# CMPSU-600CXV2 ), with its maximum combined +12 Volt continuous current rating of 40 Amps and with two (6+2)-pin PCI Express supplementary power connectors, is also more than sufficient to power your system configuration with a single GeForce GTX 670 graphics card.
 

There's no reason why it wouldn't be.

It will have more power connectors than your current OEM 300W power supply unit.

It should be exactly the same physical size as your current power supply so you shouldn't have any problems fitting it into the computer case.