Well, I ran Wprime 32M at 3900, and SuperPi 32M, Cinebench 95 and 3dMark06 at 3850.
It's watercooled (240 rad) but everything is inside the (closed) case, with silent fans, so temps are my limit atm and I am not pushing too far for 24/7.
Had it running at 400x9 for 3-4 days, running 3dMark loopes overnight and I didn't get any crashes or errors, just scary temps in the high 70s. Now that it's getting warmer here, I'll leave it at 400x8 and wait for my D9s before I start another benchmark session.
I have to say the Commando handles 400MHz fsb quite easily. I am worried about my rams though (Gskill 2GBPK), because after 410-415, multi-core prime fails after 2 seconds on the memory test (blend) while it handles small FFTs for hours...