Thermaltake Silent Boost K8 Heatsink


Fan Speed:

245010% RPM

Fan Dimension

80x80x25 mm

Max Air Flow

27.5 CFM

Heatsink Dimension

85x73x48 mm (46 fins)

Air Pressure

25.97 Pa-min

Rated Voltage



21 dBA

Started Voltage


Bearing Type

Ball Bearing

Rated Current


Life Expectation

60,000 hours

Power Input





Silent Boost K8 Heatsink fan
Small bag thermal compound
Installation guide


The "Hydro Wave Bearing" fan spins at 2450 RPM and operates on, as you probably guessed, ball bearings. That and the multi-leveled air duct surrounding the fan blades make for a very quiet unit. The only sound I heard radiating from my case were the 3 other case fans.

Heatsink Surface:

The base of the copper heatsink is was you would expect. The face of the base has sanding scratches all across its surface, but none of these were very deep grooves and performance most likely isn't affected by them. The included thermal compound gets rid of the problem entirely by filling in these grooves. As you can see above, Thermaltake decided to advertise their URL on the base as well as the side of the heatsink.

There are a total of 46 fins copper fins attached to the base of the heatsink. This is 20 less than Thermaltake's Volcano 12, and seems to be a step backwards since the more fins a heatsink has the better it dissipates heat.


Installation of the Silent Boost K8 was a very pleasant experience. After removing the stock AMD Athlon 64 heatsink from the processor, I applied some OCZ Thermal compound. Then I put the heatsink in place, engaged the clip onto the retention frame and flipped the lever. Piece of cake. This new style of screwdriver-free heatsink is much better than older heatsinks. There is no longer a worry about slipping and jamming the screwdriver into the PCB of the motherboard, or worse yet the circuitry. Another worry was that the heatsink may not fit because on the FIC K8 motherboard there is a line of capacitors along the left side of the CPU, but the Silent Boost K8 is the same size as the stock AMD cooler so there was no conflict with space.


The Testing Rig

Athlon 64 3200+
FIC K8-800T
512MB Kingston HyperX PC3200
Maxtor 120GB 7200RPM 8MB cache
ATI Radeon 9800 Pro
Khypermedia 52x24x52 CD-RW drive
Raidmax Scorpio Case with 3 case fans

For idle tests, the computer was simply booted up and left to sit for an hour. For load tests, an hour of UT2K3 play followed by an hour of Prime95 was the stress factor. Temperatures were read by Gigabyte EasyTune4 and verified with on-board temperature probes of the K8 motherboard. Since I don't have any other heatsink fan units to compare the Silent Boost K8 to, the stock AMD Athlon 64 cooler will be used.

In both tests, the Silent Boost K8 cools the processor by an average of 3 degrees more than the stock Athlon 64 cooler.

In conclusion the Silent Boost K8 is a very well built heatsink unit and it does offer a reason to upgrade from the stock AMD Athlon 64 cooler due to cooler results. The stock AMD cooler is great heaksink fan and the fact that the Silent Boost K8 out performs it is a nice pat on the back for Thermaltake. While it isn't a dramatic difference in temperature, every little bit helps when looking to do some overclocking. With that said, I recommend the Silent Boost K8 to any Athlon 64 owner that is into overclocking.

SLRating: 8.5/10

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