DX58SO B3 stepping motherboard PCN: E29531-503
Technically, this still wouldn't satisfy the minimum BIOS requirement for being able to boot the new Intel batch of D0 stepping Core i7 CPU's from the DX58SO.
See BIOS requirements for DX58SO - Core i7 D0 processors: HERE
Description of Change to the Customer:
Update BIOS to version SOX5810J.86A.3435.
An SLI connector will be added to supplied accessories.