Cooler Master ThermalFusion 400 Thermal Paste
Author: Zahn Funk
Editor: Shawn Knight
Date: 03-18-2009
Provided by: Cooler Master
Testing / Conclusion

Two sets of operating specs were used for the 6400+ X2 processor, the stock configuration of 3.2GHz @ 1.4v and an overclocked setting of 3.4GHz @ 1.5v. A slightly higher overclock of 3.5GHz @ 1.55v was also attempted, however it was found to be too unreliable for consistent testing. Both CoreTemp and OCCT were used to record temperatures for both cores and the average temp was used for comparison. I'm testing the Cooler Master ThermalFusion 400 against my personal favorite and prior thermal paste leader, Tuniq TX-2.

In all tests the Cooler Master ThermalFusion 400 performed at least as good as the Tuniq TX-2, if not better in some cases. The variance is probably within the margin of error, however the higher temperature consistently fell to the TX-2, indicating the TF400 may hold a slight advantage.


The Cooler Master ThermalFusion 400 has proven itself to be a leading contender in the world of thermal interface material. While I certainly haven't tested all of the different brands and types available, I've had my experience with some of the top names such as Arctic Silver 5, Arctic Silver Ceramique, OCZ Freeze, Thermalright Chill Factor and the Tuniq TX-2. Based off of previous results and this most recent testing, it seems the Cooler Master ThermalFusion 400 may have claim to the top spot among these thermal pastes, although the competition with TX-2 was very close.

Aside from performance, the ThermalFusion 400 was moderately easy to apply, although the included applicator probably has limited usefulness. If it were a bit stiffer or the paste a bit thinner it would no doubt have been more handy. As it is, it is just as easy to glob on an abundance of paste in a more random and unorganized way and let the excess simply squeeze out the sides when the heatsink is installed. Like the TX-2, the ThermalFusion 400 is very easy to cleanup, the majority of it wipes off cleanly with a dry cloth. This is in contrast to other, stickier pastes such as AS5. Additionally the ThermalFusion 400 does not seem to thicken or dry out over time, although a long-term test of the product was not available at the time of review.

The Cooler Master ThermalFusion 400 was found to be available for right around $10. This is significantly higher than most equivalent pastes, which average around $5-$6 for a slightly smaller 3.5g portion. Undoubtedly the inclusion of the applicator and the fancy retail packaging add to the cost, however keeping in mind the performance results, and the extra half a gram of material, it certainly may be worth the additional expense. In any case, $10 is still a small price to pay for a top of the line thermal interface material.

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