Zalman CNPS7700-AlCu Heatsink/Fan

Cooling
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ZALMAN'S SPECIFICATIONS

Zalman cites a °C/W performance difference of .02~.04 (depending on fan speed setting) between the lighter hybrid and the heavy all-copper versions. Whether the difference is worthwhile really depends on your application, but in practice this kind of difference can be easily swamped by differences in case airflow and other component choices.

Specifications CNPS7700-AlCu CNPS7700-Cu
Dimensions (mm) 136(L) x 136(W) x 67(H)
Dissipation Area (cm2) 3,268
Base Material Copper & Aluminum Copper
Weight (grams) 600 918
Thermal Resistance (°C/W) Silent Mode 0.28 Silent Mode 0.24
Normal Mode 0.21 Normal Mode 0.19
Integrated Fan 120 mm diameter, 0.35A, 12VDC
Fan speed 1,000 ~ 2,000 rpm
Fan noise 20 dBA min; 32 dBA max, ±10%

It's also interesting to look at the differences between the 7700-alcu and the smaller 7000-AlCu

Specifications CNPS7700-AlCu CNPS7000-AlCu
Dimensions (mm) 136(L) x 136(W) x 67(H) 109(L) x 109(W) x 62(H)
Dissipation Area (cm2) 3,268 3170
Base Material Copper & Aluminum
Weight (grams) 600 445
Thermal Resistance (°C/W) Silent Mode 0.28 Silent Mode 0.29
Normal Mode 0.21 Normal Mode 0.22
Integrated Fan 120 mm diameter, 0.35A, 12VDC 90 mm diameter, 0.23A, 12VDC
Fan speed 1,000 ~ 2,000 rpm 1,350 ~ 2,600 rpm
Fan noise 20 ~ 32 dBA, ±10% 18 ~27.5 dBA, ±10%

It's curious to note that:

  • The total cooling area is increased by only about 3%. This means the bulk of the gains in performance comes from the increased airflow of the bigger fan
  • The performance is improved by only 0.01°C/W.
  • The noise penalty for the tiny performance gain is +2 dBA at minimum noise / cooling and +7 dBA at maximum.

In short, judging by Zalman's own specifications, the 7700-AlCu has a tough lead to follow in the 7000-AlCu

How about the differences between the all-copper versions of these HSF?

Specifications CNPS7700-Cu CNPS7000-Cu
Dimensions (mm) 136(L) x 136(W) x 67(H) 109(L) x 109(W) x 62(H)
Dissipation Area (cm2) 3,268 3170
Base Material Copper
Weight (grams) 918 775
Thermal Resistance (°C/W) Silent Mode 0.24 Silent Mode 0.27
Normal Mode 0.19 Normal Mode 0.20
Integrated Fan 120 mm diameter, 0.35A, 12VDC 90 mm diameter, 0.23A, 12VDC
Fan speed 1,000 ~ 2,000 rpm 1,350 ~ 2,600 rpm
Fan noise 20 ~ 32 dBA, ±10% 18 ~27.5 dBA, ±10%

Here, the performance improvement at the low speed setting is a bit more significant at 0.03°C/W, with a noise penalty of +2 dBA. But in our view, the mass of 775 grams is already high; 918 grams really is best avoided.

Finally, here is a final interesting comparison: According to Zalman specs, the 7000-Cu outperforms the bigger, noisier but lighter 7700-AlCu. Just by 0.01°C/W in cooling but by 2~7 dBA in noise.



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