"Suitable motherboards don't simply require a 790FX or 790GX plus the SB750 - they also need a direct connection between the southbridge's seven GPIO pins to the Socket AM2+ processor's CPU pins. The link must be mediated by a 1.8V-3.3V level shifter circuit, the document states."

from article...

very interesting, maybe a bios update for those of us who have sb600 chipsts?