Hi nolij:
In Manual of motherboard, in page 25 :
http://download.gigabyte.us/FileList/Manual/mb_manual_ga-x58a-ud3r_v2.0_e.pdf1/2) ATX_12V_2X/ATX (2x4 12V Power Connector and 2x12 Main Power Connector)
With the use of the power connector, the power supply can supply enough stable power to all the components on the motherboard. Before connecting the power connector, first make sure the power supply is turned off and all devices are properly installed. The power connector possesses a foolproof design. Connect the power supply cable to the power connector in the correct orientation. The 12V power connector mainly supplies power to the CPU. If the 12V power connector is not connected, the computer will not start.
• Use of a power supply providing a 2x4 12V power connector is recommended by the CPU manufacturer when using an Intel Extreme Edition CPU (130W).
• To meet expansion requirements, it is recommended that a power supply that can withstand high power consumption be used (500W or greater). If a power supply is used that does not provide the required power, the result can lead to an unstable or unbootable system.
Sorry, only PSU with 2x4 12V is okay for your motherboard.
I check a Bios Version on WebLink here :
http://www.gigabyte.com/products/product-page.aspx?pid=3449#biosAbout a BIOS version: Is not recommended to have a Beta BIOS.
So I think if you have a possibility to install a FF Bios Version is the Best.
But Wait before make this action. Maybe other person help you otherwise.
Gloup_Gloup