Re:BIOS update for x58 sli
First off, as I do myself, if everything works perfect right now, I wouldn't touch it. If it ain't broke, don't fix it. That and Measure twice cut once are 2 suggestions I kinda live by. That aside, if you are planning on some upgrades, or looking at faster RAM, possibly a lot more of it, the BIOS updates would definitely be advised.
Remember, if you do update the BIOS, you will need to set all changes made previously on the BIOS again after the update, so any SATA, RAM, USB etc settings will; be back to factory default, so anything you have set now, will need to be readded, preferably BEFORE you go into windows.