I am considering De-IHSing my Phenom II, i have successfully done this to my old Athlon 64 X2 4600+ and dropped 5^ C by mounting the waterblock right onto the die carefully with AS5.
Unless they changed, the paste they put between the die and the IHS is pretty crappy. low quality cpu paste.
i have actually heard of people trying to do this with dremels, let me say, MORON!
How To:
4 Razor blades, preferably the adjustable length ones that can extent to about 3-4 inches of exposed blade!
hack saw the glue all around the ihs making DAMN sure you keep the blade PARALLEL to the processors circuit board as so to not cut into it.
And never cut deeper then the thinkness of a toothpick or so, the IHS gue is like the thickness of 2 quarters depth wise, and only paper thin.
cutting any further usually means you risk cutting a mosfet right off the circuit board like yet another dork on youtube.
and never get frustrated and just try pulling the damn thing off, even once its loose!
a particular dummy pulled the die right off the circuit board, and it was an FX-60.
the paste while crappy does get hard and stick like any cpu paste does! gentle slight twists back and forth to break the seal just like a HSF. eventually it will just lift off effortlessly!
I pushed my X2 4600+ (2.4ghz) straight to 2.85 at 40C without the IHS, with the IHS i only got 2.7 and it was 45+C