Thermal Paste Roundup 2015 – 47 products tested with air-cooling and liquid nitrogen (LN2)

Changes and Improvements

To improve the accuracy I decided to build my own thermal paste test bench, on the basis of two copper plates, heating elements and very accurate thermometers.

The basic idea is to have one thick copper plate with 6 x 40 Watt heating elements. On top will be a surface area of about 30 x 30 mm which is similar to the latest core i7 Haswell CPUs. In addition to the heating elements there is a special PT100 measuring probe in the copper plate. The probe has an accuracy of 0.01 °C between 0 – 100 °C (using 1/10 DIN!).

Another copper plate will be placed on top with a second and similar probe. The delta temperature between these two probes will provide the performance of the thermal pastes.

To measure the temperature itself I use two Greisinger GMH 3750 High Precision thermometers. In combination with the 1/10 DIN the resolution is 0.01 °C with a maximum measuring error of 0.03 °C.


Both Greisinger GMH 3750 thermometers will be connected via USB to my laptop. Using the special Gresinger software you can read out the current temperature of both thermometers at the same time and also log them into a chart.

The result is a very accurate thermal test bench. You can find all the details and the build log here.






  1. Introduction and Basics
  2. Test requirements
  3. Improvements compared to the last test
  4. Test circumstances and consistency
  5. Gramm vs. Volume
  6. Air-Cooling results and buy recommendation
  7. Extreme Cooling Test
  8. Extreme Cooling Test (results#1)
  9. Extreme Cooling Test (results#2)
  10. Extreme Cooling Test (results#3)
  11. Product Details
  12. Conclusion