Shuttle P4H Heatpipe

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Reasonable noise, good performance – Joe

SUMMARY: Although not for general P4 use, a good heatpipe CPU cooler.


A friend (Brett) dropped by for a chat and brought over Shuttle’s PH4 Heat-Pipe. This is designed for use in Shuttle’s small form factor systems (Model #s SS50C, SS51G, SV51F and SB51G), and as such is NOT necessarily suitable for general P4 use. Two factors limit its use:

  • The heatpipe fin assembly overhangs the motherboard by quite a bit (3″ – 4″)

  • The fan assembly is designed for mounting in Shuttle’s case; mounting it to the radiator requires a user mod.

I should also note that the fan wire is very short – you might need to lengthen it. Shuttle is selling these for $39.

The fan assembly slips over the fins:


The four knurled screws are to mount the fan to Shuttle’s chassis – to adapt it, you would need to design a different method; it should not be too difficult.

The fan is an Sunon Model #KD1208PTB1 – an 80 x 25mm unit rated at 39.5 cfm @ 3000 rpm, 33 dBA¹. I found it to be tolerably quiet – I measured its noise at 61 dBA with a Radio Shack sound meter 8″ from the fan’s intake, substantially less than a Delta 38 (about 69 dBA). It’s also safe to use a motherboard fan header (2.3 watts).

The base is a copper baseplate:


Affixed to it is an aluminum finned top piece. I’m sure it adds to the cooling – good airflow over these fins may increase performance a bit. The heatpipes have a liberal application of thermal grease to enhance heat transfer.

The clip is a good one:


It’s easy to mount and very secure.

Overall, the build quality is a step above other heatpipes I have seen and has a very sharp appearance.


I tested the Shuttle P4H on an Acorp 4S845A motherboard with a modified P4 1500 to read CPU case temps.

TEST RESULTS – Motherboard

CPU Case Temp

Ambient Temp



MBM Temp

Acorp 4S845A

35.7 C

22.2 C



31 C¹

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