Yes very happy with this chip, I was originally going to go for a E8400 but this is my first build so thought I'd go for the cheaper option incase I messed it up!
13 hours stable @ 3.6Ghz all good

288x12.5
vcore in bios 1.425v in cpu z 1.408-1.416v.
mem DDR2-862Mhz 2.1v 5,6,6,18.
NB 1.4v FSB strap 266mhz
Need to get the memory sorted now, 4Gb Ocz gold edition 1066.
Just tried 3.806Ghz again now, orthos is only stable for 5-10 min.
331FSB x 11.5 multiplier
vcore 1.45v in bios, 1.424v cpu-z
Mem - 995Mhz, 2.2v
NB-Auto
From what I've read seems like need between 1.5 to 1.7v to even get to 4Ghz (unless your lucky with your chip), I think the most I would risk would be 1.5v, but would need a better cooler or redo the TIM.
I'm having trouble getting my memory stable at higher speeds as well, I've tried increasing the mem (2.2v) and NB (1.44v) voltages but can't even get it to boot. Not sure I understand NB voltage very well, it always seem to work better on Auto!