I got one from Canada Computers batch #820A596 and it wasn't great. 1.36v for 4.3GHz but anything above that no matter what was not stable in Linpack or Orthos no matter the voltage. I think it was just a bad individual because I've seen others of the same batch do better. I returned the chip due to the stuck sensors (they were stuck at 40*C) and I got a Q820A597 and this one is a sweetheart. So far I'm at 4.4GHz at 1.34v and IntelBurnTest stable for 5 runs. It's now running Orthos at home so we'll see how it does when I get home this evening. It's a bit warm for my tastes, but I think I need to re-seat my Fuzion, as I'm pretty sure I applied too much TIM.