its made from an unknown manufacturer, its 500 watts
sorry wrong thread
The Geforce GTX 660 requires a psu with 24A on the +12v rail and a 450W PSU minimum you have enough wattage , is there anything written on the side of the psu a table perhaps with the amps for the +12v rail ?
Unknown manufacturer = 750ti. It's the fastest card that doesn't need supplementary power and with a junk PSU, you want a card that sips electricity, not gulps it.