GIGABYTE X58 series motherboards may have compatibility issues with Intel Core i7 940 and 920 production version CPU, so we strongly recommend you to update the latest BIOS as following for better performance:
EX58-EXTREME BIOS version F3
EX58-UD5 BIOS version F3
EX58-DS4 BIOS version F3
You can use BIOS build-in Q-Flash utility, or Window based @BIOS utility to update BIOS.