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AOpen ACP4SH Pentium 4 Heatsink Review
AOpen ACP4SH Pentium 4 Heatsink Review
  79%   
Abstract: Designed with a skived copper base, and heatpipes, this cooler is technically used with the socket 775 Intel processor in the XCube system.

 Manufacturer  Category  Published  Author 
AOpen   Cooling / Heatsinks   Nov 21, 2004   Max Page  

Home > Reviews > Page: Surface Roughness Comparison

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
2L4L8L8G16G16BL32G32BL32ST63G63M63P63ST125M125P125ST250M250P250ST500M500P500ST

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 AOpen ACP4SH heatsink has a surface roughness of approximately 16 microinches, which is considered very good. Move your mouse over the tabs above and look at 16M for an approximate example of what this surface finish looks like.

Acoustic Samples: Listen to this Heatsink!

The fan draws 0.42A, and when it is running at full speed can be a bit noisy. 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.

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.
Listen to this Heatsink now.

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-2000 passive N/A
Verax P16Cu 31.5 dB
Spire SP420B8 40.2 dB
Verax (high) P17CuX 40.8 dB
Zalman CNPS7000-Cu 41.7 dB
ArcticCooling SuperSilent4 Pro 41.8 dB
Zalman CNPS7000A-Cu 42.2 dB
Evercool NW9F715CA 47.3 dB
Intel Stock 3.06GHz 47.5 dB
AVC Z7H2403012 48.2 dB
Aopen ACP4LC 48.7 dB
Scythe Kamakaze 51.0 dB
Verax Polargate AL S 52.5 dB
Jetart JAP416A 52.8 dB
Asus Crux P4 XB7N (H) 52.9 dB
JMC Products 401100 53.0 dB
Coolermaster (high) Hyper6 KHCV81U1 54.1 dB
Thermal Integration TI-A8736N 54.8 dB
Alpha S-PAL8952 55.8 dB
AVC 117140 56.1 dB
Vantec VP4-7245 56.8 dB
Taisol CEP447181 56.8 dB
Coolermaster (high) Jet4 58.9 dB
Cooljag JACE2DC/180 59.2 dB
Cooljag E44C/180 60.9 dB
Cooljag 2QC/180 61.1 dB
Dynatron DC1U-B02 62.2 dB
Gigabyte (high) PCU31-VH 63.7 dB
AOpen ACP4SH 67.1 dB louder

In this particular reference list, the AOpen ACP4SH heatsink is loudest, with a measured noise output of 67dBA. Next up, the temperature test results!

 Previous Page ° ° Next Page 

Table of Contents:

 1:  AOpen ACP4SH Pentium 4 Heatsink Review
 2:  Examining the Heatsink
 3:  Heatsink Thermal/Acoustic Test Parameters
 4: — Surface Roughness Comparison
 5:  Final Heatsink Temperature Comparisons

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