Well, Basically ALL the Q9650's are Great Chips. they are all clocking Crazy high clocks with low temps. You should for sure be able to get to 4.0 Ghz on air, with a decent Cooler.

you're CPU was made a week after mine.. the L, then the 8 is the year.. so 08, the 23 is the week it was made. so near the end of May, of 2008. and then B.. B's are better Than A's.
A is the outer edge of the Wafer, and B's are the inner half of the wafer.. People claim that B's are better, but we don't really know. I don't know.

There's plenty of feedback, not on your batch #. but on your CPU.. everyone is getting great results with them. and I'm sure you will also.

enjoy!