My load tester uses two 150W cartidge heaters in a copper block, bores cut with a boring head on the mill so they are nice and tight clearance.
I milled the die shape of an Intel quad into the top of the block. For a while I was using TIM between the simulated dies and the top an Athlon proc. Then I switched to a LGA775 processor lid and soldered it to the dies with a very thin layer of solder. It's hard to see but there is an air gap around the perimeter of the IHS and only the dies make contact with the IHS.
Stancor thermal switch mounted to back of the block. It saved my load tester from a meltdown about two weeks after I installed it
CNC'd Delrin flange with a stepped square cutout for the copper block to sit in. When I want a very accurate test I just wrap the whole thing in Armaflex.



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