Quote Originally Posted by tastymannatees View Post
I may have some similar springs at work, I see if I can get a reading on them. I have one heat sink for an HP workstation with springs for a 90 psi mount I wonder why Intel's spec is @ 43 seems a little light to me
It's actually a bit more complex than the spring tension alone. The actual sink hold down is an "X-bar" affair that clamps the sink. Real clear picture, step #4 here.

The screws actually bottom out on stops when they hit the post on the backplate, or in Bail's case, the mobo.

Bob