Will this work well with an aluminum cpu cooler?

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Not sure what the other guy is talking about a 40C degree difference. I have a water cooled EK clear acrylic copper waterblock with a dual 140mm radiator. With this paste I myself idle a 3930k @ 40C degrees.( I think max temp for these CPUs are 38.7C degrees) You should in reality hopefully get like 5C degrees cooler vs something like Arctic Silver 5. Although, like he stated for your heatsink, copper is a really good thermal conductor. Better than aluminum in my opinion.
tomshardware has some really good charts, on whats what when it comes to thermal compounds. PK-3 came up 3rd on the list in Octobers 2013 lineup. You should check it out. There some cool liquid metal stuff that cools about 3C cooler that was 1st on that particular list.

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