I got my Opteron in the mail from newegg this afternoon! The stepping is:
CACJE 0552FPEW
I popped it in and began running Super Pi's! Here is what I have so far.
Pi 1M @ 3.0Ghz - 1.5v
Pi 32M @ 2.9Ghz - 1.5v
I think I am giving Crash a run for his money