Well, the Freezone blew away the Zalman 9700 I was using. It got warm under load (high 70's), but that was at 3.85 GHz and about 1.65VCore. Seems like these things are hit and miss a little.
My best with the Freezone:
3Dmark06 19160 - 3.85 GHz
And, on a PC I built for another, they were able to get their E6600 to 4.0 GHz with the Freezone from TiKiMaN.