Prolimatech Pk-3 Nano Aluminum Thermal Compound
This is a best of the best thermal compound from top tier Proilmatech. This paste is fairly thick and so is a little harder to apply so it's recommended you warm the paste before applying it to ease spreading. It is rated at a top notch thermal conductivity of eleven point two watts per meter kelvin (11.2 w/m*k) which is considered excellent. It is non-corrosive and non-electrically conductive and is said require no burn-in time for top performance. Available in five gram packages, this best of class performing compound is well worth consideration if you don't mind a little more involved application process.