For this guide I did some benchmark results for 2 different CPUs, my 3500+ and Opteron 146. For my 3500+, I had temperature problems with the IHS on. My load temps soared in excess of 65°C even with moderate vcore values, and a confirmed perfect AS5 application.
3500+ Venice with Thermalright SLK-948u and Vantec Tornado 92mm
9 °C cooler idle and a whopping 22 °C cooler under load is a huge difference after the IHS is removed!
Opteron 146 with Thermalright XP-120 and Panaflo 120mm Hi
Another very respectable result, although not as dramatic as with my 3500+ Venice, 12° cooler under load is a big deal on an Opteron.