I got three E8400 retail CPUs to 590fsb on warm air (Summer in my land) with Asus P5B Deluxe Rev 1.04G. That's 590fsb dual 32M Superpi stable.

Results here, but something very odd occurred too.
http://www.xtremesystems.org/forums/...d.php?t=174145

P5B Deluxe owners, don't throw your board away yet. Test it with 45mm