“You can literally uninstall your current video card drivers, and replace the single card with a pair of SLI-ready video cards and boot straight in to Windows. After installing the video card drivers again, you will then be able to use the video cards in SLI mode without ever needing to enter the motherboard’s BIOS menu. If you just want to use the standard 8x / 8x PCI-Express lane configuration with two video cards installed there is no need to enter the BIOS. However, there is the option to enter the BIOS should you want to change the configuration of the PCI-Express lanes.”
Very cool.. this should have been done from the get go. Read more on it over at Bit-Tech.