I know nothings of Intels, but I can tell you I've got this 35w 2400+ XP-M chip from 1.8ghz to 2.5GHz stable. I've got valueram though, so possibly with better RAM and a little luck you can get it higher. I hit 2.8GHz once but then the system didn't want to boot back up under that. I hit 2.7GHz on it, but it would freeze randomly. So now just for stability reasons I put it down at like 2.525GHz I think is what I'm running now. 42C Full load but I have a lot of cooling in my case. Sorry if this is all useless garbage to you, but I honestly know nothing of Intel and I was just suggesting a possible alternative unless AMD is out of the question for you.
On another thread I posted my benches and when I had the chip up at 2.7GHz it'd beat the 3.4GHz processors in MFlops, but the bench below it was usually lower.