AMD state 15-25lbs of static mounting pressure.
They also state a maximum of 100lbs of dynamic pressure, being shocks incurred by bumping the case, such as driving to a LAN or something.
If you never move your case, that 100lb rated maximum is probably close to where you can take the pressure to. However, I'm no materials engineer so I could also be totally wrong on that, but I do know people who have cranked down the White Water springs all the way on AMD T'Bred CPU's, which equates to around 70lbs of pressure with no ill effect.
Then I've heard of people who drop the springs altogether and tighten until the motherboard flexes slightly. I've even done this myself, and this probably equates to around 100lbs of pressure.
As long as the pressure applied is flat and even, you can put fairly dramatic amounts of pressure on the core without apparant harm.
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