The board has the following power supply connectors:
• Main power – a 2 x 12 connector. This connector is compatible with 2 x 10 connectors previously used on Intel Desktop boards. The board supports the use of ATX12V power supplies with either 2 x 10 or 2 x 12 main power cables. When using a power supply with a 2 x 10 main power cable, attach that cable on the rightmost pins of the main power connector, leaving pins 11, 12, 23, and 24 unconnected.
Note : data taken from TPS
For more info download TPS from here http://downloadmirror.intel.com/18128/eng/DX58SO_TechProdSpec.pdf http://downloadmirror.intel.com/18128/eng/DX58SO_TechProdSpec.pdf
& check page no. 43-44