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Are you making the point I am ignorant because I have all AMD CPU's
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jaydee, no offense mate, but I think you need to switch to decaf coffee. Unlike some people, I never thinly veil an insult. If I'm going to insult you, there'll be no mistake.
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are you saying the AMD IHS on the Opterons is to those specs, or are you saying the P4 IHS is to those specs?
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The specs that I have above are for the P4 IHS. It is 30x30mm x 1.5mm thick, with a 1/16" hole sitting about 8mm in from one corner that needs to be plugged if you want to attempt what you're describing.
My concern about drilling into it is that no accident is made and one drills through the core.
I actually like the "drilling through the base of the block" idea better and I suggested something like this for direct-die cooling in another thread, but it could easily be applied here. Drill through the base of the (Cascade-style) block, and mill out an O-ring groove in the block base around the holes. Lap the IHS flat, stick some thermal paste on it (to facilitate thermal transfer into the cup walls). Throw an O-ring on the block and mount the block to the CPU. The pressure of the mounting will seal the O-ring to the IHS adequately.
[Edit: Bah - cross post with BigBen2K above while wife distracted me to fix a broken washing machine...]