Modes, could be dude, i think one of em (of which there could be potentially 4) has gotta be to turn the chip on/off, which takes permitations down to 3.
For the second switch i think its gotta be to 'lock' the bios if u will, to ensure that new security features from the boys at M$ don't put bios replacements on new games or something? I dunno, there's a million things it could be.
Apart from that tho, the chip looks to be sweet already (barring any bugs, touch wood). We just need EvoX to knock us up a new bios which will get all them features we crave!