You could search the seti results from other member to verify that. But I would wait a little to see the conroe performance too. Seti Enhanced takes lots of time to process a W.U. Maybe this month there will be some optimized clients, and we'll be able to see the real processor speed and power, becouse the way it is now, no one can tell that precisely.
But just for the record, I have raised my oc to 2.7ghz and my opteron is doing (with the standard application "5.15enhanced") 3h:30min p/W.U.