This chip I have seems like a gem, I finally got the couple of bits I needed to redo my water cooling so after installing all my bits I dropped the NB, Ram and HT multi's and started cranking up the HT ref, it will do 3.8ghz on stock volts (1.25v) which is a 1.1ghz increase, that is a mental result, and after putting the ram/nb to close to stock settings, stable through 10 loops of IBT on maximum stress level.
So after finding that out, I decided to see how much I could push this chip, so far I have reached 4ghz (300x13.5@1.325v) with the NB and HT running at 2.4 and my ram at 1600mhz with temps reported in coretemp as 27C and in overdrive as 39C, and as before it passed 10 loops of IBT I will see how much further I can push it at the weekend.
And on the subject of Overdrive, it is the best thing I have ever used to overclock, full stop, it is so easy to add a few mhz, or bump the volts and find a stable setting before committing it in the bios