pulled those numbers out of my ass.
But for the reason why not to do it; it introduces error; accurately reproducing a TIM repeatedly is very difficult.
Going off of the 8C gradient for an 80 watt heat source we've seen and debated, the TIM between die and waterblock has .1 C/W heat resistance, the die/IHS will probably be similar, and this will be uniform for all blocks mounted on a P4; therefore the effect of any IHS waterblock tests would only be to find this value; and totally useless at that being an inaccurate simulation of what we are measuring.
Mounting sideways vs. Flat down will simply stress the mounting and the TIM; it would increase error of the system without aaffecting block performance; the sideways set up tests the quality of the waterblocks mounting, and as this will be the most difficult part to keep uniform and accurate, should not be stressed to keep error between mountings to a minimum.
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