P5Q Deluxe rocks. I have virtually no vdroop at all. 1.3000 set in BIOS, 1.296 reported by CPUZ under load.
Currently running my X3350 @ 470 x 8 w/ 1.3000 v in the BIOS. 3 cores are stable with lower voltage but the 4th core always crashes p95 so I'm still finding stable settings for 3.8ghz.