Zalman CNPS7000-Cu

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Low noise heatsink with very good cooling performance – Joe

SUMMARY: Can be run whisper quiet with decent cooling, or merely quiet with very good performance.

CNPS7000-Cu

The good guys at The Heatsink Factory were nice enough to send a sample of Zalman’s CNPS7000-Cu. This is one of the more interesting and very nice looking P4 heatsinks I’ve seen. Designs which feature “enclosed” fans tend to be very efficient and less noisy.

The fan used is 92mm, which gives some idea of its size – it measures 109mm diameter x 62mm high and weighs 773 grams. Check Zalman’s site for motherboard compatibility and a well done video demonstrating installation.

Zalman includes a rheostat

Rheostat

with this unit which allows users to dial in fan speeds. The problem I see with it is that it’s not designed to mount in a readily accessible location – unless you intend to run your case without a side panel, adjusting fan speeds will require removal of the case’s side panel. This is fine if you intend to “set it and forget it”, but for continually tuning fan rpms, it’s not too handy.

At its lowest and highest setting, I could not measure fan noise with a Radio Shack sound meter¹ 8″ from the fan; at its lowest, it’s virtually silent.

The base is formed by compressing the fins with two bolts:

Base

The base is then polished to a flat finish – I found it to be very well finished and doubt that hand lapping will improve it.

The mounting mechanism is a good one:

Clip

The long brackets slip into the P4 retention bracket and, using two screws, the heatsink bolts into the brackets. I found it fairly easy to mount, as long as your handy with a magnetic screwdriver. In additon, there are two “nipples” for AMD Athlon 64 CPUs.

THE TEST

I tested the Zalman CNPS7000-Cu on an Acorp 4S845A motherboard with a modified P4 1500 to read CPU case temps.

TEST RESULTS – Motherboard
Motherboard
CPU Case Temp

Ambient Temp

Delta

C/W

MBM Temp

Zalman, 1360 rpm
34.4 C

22.2 C

13.2

0.23

30 C²

Zalman, 2211 rpm
31.8 C

21.2 C

10.6

0.18

27 C²

² MBM Temps as measured by the P4’s on die diode.

Delta = CPU temp – Ambient Temp
C/W = Delta / CPU Watts