AS2/3/5 is not conductive but is capacitive. You will get problems if you put it on traces!
Id use a mica shim or similar, infact you oculd just glue a bit of paper on the back much like how you used the templates in making the blocks. You wont get much heat atall from the back so its not worth cooling it - With my 9700np core at 470/1.75v its still very close to ambient (though Ive only measured with my fingers...)
Also has your card got a heatspreader on the back? This will get very hot (though very low amount of heat) so i suggest you cool that too, change it, theres only one chip that gets hot. It doesnt need w/c, but Bladerunner did ono his...
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