CoolerMaster Surface Roughness Comparison - Hyper6 KHC-V81-U1 FrostyTech Review

Surface Roughness Comparator:

Surface finish is an important factor that we all look for when holding a new heatsink. Flipping a cooler over to see how well the base has been machined is a quick way to judge the attention to detail that was put into making it. The following FrostyTech Surface Roughness Comparator offers a concise cross section common machine surface finishes. Not every heatsink base will fit into the envelope of this gage, but it does offer a very handy set of representations.

This commercially available gage has 22 machined surfaces from 2 to 500 microinches; Lapped (2, 4, and 8 µ" RA), Ground (8, 16, 32, and 63 µ" RA), Blanchard Ground (16 and 32 µ" RA), Shape Turned (32, 63, 125, 250, and 500 µ" RA), Profiled (63, 125, 250, and 500 µ" RA), and Milled (63, 125, 250, and 500 µ" RA).

FrostyTech Surface Roughness Comparator

the base of a heatsink plays an important role in how well the cooling apparatus interfaces with the processor. poor surface roughness will affect a good heatsink just as much as a good surface finish will improve thermal conductivity. in an effort to put a more quantitative spin on the comments we provide about base finishes, frostytech has begun using a surface roughness comparator.

move your mouse over the image above to see an example at right. numbers are in microinches, and finishes from 2 microinches to 32 microinches are excellent-to-good.

Evaluation Notes:

The Coolermaster KHCV81U1 heatsink had a surface roughness of approximately 8microinches, which is considered good. Move your mouse over the tabs above and look at 8M for an approximate example of what this surface finish looks like.

Acoustic Samples: Listen to this Heatsink!

With fan speed control at your finger tips, the Coolermaster Hyper6 can be as loud as 54 dBA, or as quiet as 47 dBA with the stock fan. In the unit we tested, there seemed to be a fair bit of motor noise - so perhaps there was a bad bearing in the fan. Considering also that the tops of the heatpipes come right through the aluminum fan shroud, it could have also been vibrations from the two adjoining bits of metal (there is no glue to stop the shroud from rattling around). We've split up the Acoustic Samples into two parts, the first with the fan running at full speed, and the second with it turned down to the lowest RPM.

To listen to this heatsink for yourself in operation, be sure to click on the little headphones icon below and download the Acoustic Sample MP3 file.

High - FrostyTech Acoustic Sampling Chamber

Standard Waveform view of a 10 second recording. Click on the headphones to listen to an MP3 recording of this heatsink in operation.

Low - FrostyTech Acoustic Sampling Chamber

Standard Waveform view of a 10 second recording. Click on the headphones to listen to an MP3 recording of this heatsink in operation.

Sound Level Measurements:

Listening to the actual noise a heatsink makes allows you to hear what pure numbers alone cannot get across. To further emphasize FrostyTech's reliance on cold hard facts when evaluating a heatsink, we also take Decibel readings with a sound level meter. These results may be higher than the manufacturer's listed specs, but then again these are real world measurements. Measurements are made on the dB (A) scale.

FrostyTech Sound Level Results

- Manufacturer Model Noise Level Scale

TS Heatronics NCU-1000 passive N/A

Verax P16 35.3 dB

Gigabyte (low) PCU31-VH 37.1 dB

Spire SP420B8 40.2 dB

Zalman CNPS7000-Cu 41.7 dB

ArcticCooling SuperSilent4 Pro 41.8 dB

Zalman CNPS6500-AlCu 47.4/28.9 dB

Zalman CNPS7000A-Cu 42.2 dB

Intel Socket 478 42.5 dB

CoolJag JVC661A 43.9 dB

Coolermaster (low) Jet4 44.8 dB

Arkua 8456X-8T 46.5 dB

Coolermaster (low) Hyper6 KHCV81U1 47.2 dB

Evercool NW9F715CA 47.3 dB

Intel Stock 3.06GHz 47.5 dB

Aopen ACP4LC 48.7 dB

Arkua Q85X-7J 49.0 dB

Arkua 848X-6B 49.3 dB

Titan CW9TB/SC 50.5 dB

Evercool CUW8-715 50.7 dB

Taisol CEP426151A 50.7 dB

Scythe Kamakaze 51.0 dB

Arkua 838T-7G 51.7 dB

Jetart JAP416A 52.8 dB

Thermal Integration TI-RV108N 52.9 dB

JMC 401100 53.0 dB

Dynatron DC1207BMW 53.0 dB

Spire SP411C5 53.2 dB

Dynatron DC1207BMY 53.2 dB

Dynatron DC1207BMX 53.4 dB

Thermal Integration TI-RV104N 53.5 dB

Thermal Integration (high) TI-V7035TN 53.6 dB

Zalman CNPS5700D-Cu 53.8 dB

Coolermaster (high) Hyper6 KHCV81U1 54.1 dB

Globalwin VA476 54.2 dB

Thermal Integration TI-A8736N 54.8 dB

Dynatron DC1206BMV 55.1 dB

Jetart JAP407A 55.7 dB

AVC 117140 56.1 dB

Taisol CEP447181 56.8 dB

Taisol CCP445172 57.5 dB

Coolermaster (high) Jet4 58.9 dB

Cooljag (high) CJC66IC-A 59.1 dB

Dynatron DC1U-B02 62.2 dB

Gigabyte (high) PCU31-VH 63.7 dB

Coolermaster IHC-H71 64.4 dB

Thermalright (high) SLK-900U 67.2 dB louder

The Coolermaster Hyper6 KHCV81U1 heatsink isn't the quietest heatsink on the planet when set to run at 1900RPM, but it is at least better than its full speed setting. Given the large size of this heatsink, I'd be tempted to try it out with a slightly quieter 80mm fan if I had it running 24/7 in my PC.

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