I hate most benchmarks. Simply because they never put all the processors near that range in there. In that benchmark, he only tests the E6700 and E6400.. well what the hell happened to E6600 ? It fits right in there but doesn't get benched.
I don't think they know how to overclock. At those voltages, you could have gotten much much farther. Plus, they forgot to note that the E6700 can change it's multiplier, allowing you to overclock even farther.