CoolerMaster Aero4

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Interesting design, lots of flexibility – Joe

SUMMARY: CoolerMaster’s AERO4 spans a wide performance range, from very good to very poor.

Aero4

Fan: Adjustable 1900 to 3500 rpm, 11 to 20 cfm; Size: 83 x 70 x 46 mm.

The good guys at Pham Computer were nice enough to send a sample of CoolerMaster’s latest P4 heatsink, the Aero4. Included with it is a rheostat which varies fan speeds from “1900 to 3500 rpm”; it includes both a PCI slot and floppy slot cover mount for convenient adjusting.

This heatsink features a “squirrel cage” (blower) fan:

Fan

This fan takes air in from both sides and directs it to the heatsink’s base without interference from a fan hub located above a center of the heatsink found in “traditional” fans – a purported advantage. I also like the decal in lieu of a fan grill.

The base is not all that well finished:

Base

I could easily fill machining marks on it – this is one heatsink where lapping will improve performance – perhaps 1-3 degrees better than tested.

The clip uses the standard P4 retention bracket – I found it easy to mount and very secure.

THE TEST

I tested the AERO4 on an Acorp 4S845A motherboard with a modified P4 1500 to read CPU case temps.

TEST RESULTS – Motherboard

Graph
Motherboard

CPU Case Temp

Ambient Temp

Delta

C/W

MBM Temp

Aero4, 3563 rpm, 65 dBA

38.7 C

27.6 C

11.1

0.19

36 C¹

Aero4, 2700 rpm, 58 dBA

41.0 C

27.3 C

13.7

0.24

39 C¹

Aero4, 1818 rpm, <50 dBA

45.3 C

28.3 C

17.0

0.29

42 C¹

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