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Inexpensive Coolers for AMD Processors

November 23, 2007



Part 2. Test results and summary

We use the same procedures for evaluating thermal efficiency of coolers for Socket 754/939/AM2 as for Socket 478 coolers and those that are actively used for testing LGA775 coolers. The primary data used for the consequent calculation of thermal resistance are temperature readings of the thermal diode built into a processor. What differs is the thermal source (Athlon 64 3700+ processor), the base platform (Fujitsu-Siemens D1607 motherboard), and a set of test applications.

Testbed configuration:

  • Fujitsu Siemens Computers D1607-G motherboard
  • AMD Athlon 64 3700+ CPU (Clawhammer)
  • OS: Microsoft Windows XP

We use the S&M utility to simulate maximum thermal load of a processor, and SystemGuard from Fujitsu-Siemens to monitor temperatures.

Chart 1. CPU Core Temperature

Notes
Each cooler is tested with Stars 420 thermal grease
The diagram contains complex results

Chart 2. Thermal resistance

Note
Thermal resistance θja is defined as the relation
θja = (Tj - Ta)/Ph, where Tj is the temperature of a CPU core, Ta is the environment temperature (it's 33°C in this case), Ph is the thermal capacity of a processor (in this case it's 80 W).

Finally, at the end of this article we publish the noise measurement results (the test method is described in the article Cooler noise characteristics and the method of measurement) as well as the efficiency/noise rating of coolers.

Chart 3. Noise characteristics, A-weighted sound level

Note: Background noise level 18 dBA

Chart 4. Efficiency/noise rating

Note
The efficiency/noise ratio (ENR) is calculated as:

ENR = DM*(Rt/TC)/(NL/Rn), where

Rt - reference temperature (the reference thermal resistance θja of the cooling system - 0.3°C/W), TC - the core temperature with the operating cooling system, Rn - reference noise (the reference noise level is 25 dBA), NL - noise level, generated by the cooling system, DM - denominate multiplier 10).

Table 1. Coolers statistics summary

Cooler Thermal resistance,°C/W Noise, dBA Weight, g*
Arctic Cooling Alpine 64
0.48
33
485
ASUS K8A1-8LB3
0.46
39
345
ASUS K8A4-8LB3
0.44
47
330
Cooler Master DK8-8I32A-99
0.55
35
410
Cooler Master CK8-8JD2B-99
0.46
39
485
Cooler Master CK8-9JD2B-0C
0.54
32
480
Cooler Master X Dream K640
0,541
321
445
Cooler Master X Dream K641
0.55
34
430
Foxconn NBT-CMAK8-1T
0.66
32
320
Foxconn NBT-CMAK8-2T
0.63
33
345
Foxconn NBT-CMAM22B-C
0.51
35
410
Foxconn NBT-CMAM23B-C
0.61
32
300
GlacialTech Igloo 7220 Light (E)
0.51
33
290
GlacialTech Igloo 7220 (E)
0.46
37
290
GlacialTech Igloo 7220 Pro (E)
0.44
44
290
GlacialTech Igloo 7222 Light (E)
0.51
31
260
GlacialTech Igloo 7222 (E)
0.46
36
260
GlacialTech Igloo 7310 Light
0.48
30
365
GlacialTech Igloo 7310
0.45
35
365
GlacialTech Igloo 7310 Pro
0.43
40
365
GlacialTech Igloo 7310 TC
0,461
321
370
GlacialTech Igloo 7320 Silent (E)
0.46
29
385
GlacialTech Igloo 7320 Light (E)
0.44
32
385
GlacialTech Igloo 7320 (E)
0.41
38
385
GlacialTech Igloo 7320 TC (E)
0,461
301
385
GlacialTech Igloo 7311 Silent (E)
0.48
29
395
Speeze DolphinReef III
0.50
36
3052
Thermaltake TR2 M6 SE
0.58
33
425
Thermaltake TR2 M14 SE
0.48
36
470
Thermaltake TR2 M17 SE
0.46
36
505
Thermaltake TR2 M19 SE
0.54
40
300
Thermaltake TR2 R1
0.46
31
435
Thermaltake CL-P0444
0.63
36
270
Thermaltake TMG A3
0.49
31
475
Titan Data Cooler DC-K8A825Z
0.54
40
395
Titan Data Cooler DC-K8A825Z/CU35
0.54
38
405
Titan Data Cooler DC-K8D925Z
0.48
37
385
Titan Data Cooler DC-K8J825Z/N/G
0.64
34
265
Titan Data Cooler DC-K8H925Z/N
0.53
41
285
Titan Data Cooler DC-K8K925Z/N/G
0.53
41
285
Titan TTC-K8ETB/825
0.54
42
405
Titan TTC-K8DTB/925
0.53
40
415
Titan TTC-NK32TZ
0.41
41
550

*Full weight with a retention module
1Varies depending on fan speed
2Without additional mounting accessories
Appendix. Integrated Assessment of Cooler Usability

Vitali Crinitsin (vit@ixbt.com)
November 23, 2007

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