2.9 on stock cooling would be about your max. 3.3 would be about right with a bad ass cooler. Depends on the chip mostly. My e2180 didnt like to run stable over a 333FSB and with the same Mobo my e7200 runs 421 stable. Everything exactly the same except for PSU's.
If you tossed the idea around about a better cooler , dont. For the price of the cpu and a cooler you could buy a retail e7200 and get better results.