Kinda confusing in what your stating.
Your link just shows a list of fans and hs, so its hard to understand what system your using.
List your specs, that would help us understand what you have. (
. o O (okay it's a quad, re-read the topic))
CoreTemp should have more accurate temps, TAT is really only good for testing your thermal max, and speedfan would need to be calibrated correctly, which is explained better in the Core 2 Quad and Duo Temperature Guide
Usually the core temps off speedfan would normally be 15C cooler (on c2d systems) when used right after installing it then CoreTemp, which your readings seem to be the opposite, unless you mistyped your post.