Alright, i couldnt find anything on that specific batch, but everything produced on or around that time seems to hit 550 relatively easily. It would seem you have a pretty decent chance of a dual 550MHz system on your hands.
"In the computer industry, there are three kinds of lies;
lies, damn lies, and benchmarks."
I don't have a dual OS, so I'm going to take it slow and burn each in for like 5 days then oc it then switch to the other processor. Are there any ill effects of burning in too long that provent good o/c ing?