TOCOOLS Regal P4 Heatsink

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An OK P4 heatsink – Joe

SUMMARY: An OK P4 heatsink.


The good guys at TOCOOLS sent me a sample of their P4 heatsink, the TOCOOLS Regal P4 Heatsink. TOCOOLS is a new face on the heatsink market. This is an all-aluminum sawed heatsink similar to their TOCOOLS Crown..

The aluminum base is well finished:


The clips are interesting – two wires that clip into the P4 retention base. These are not positive locking clips as seen on other P4 heatsinks:


There is no lip on one side of the clip that secures the clip such that it positively can not slip out. I would be concerned that a good knock on the case could dislodge it.

The fan is a Delta AFB0812SH – a 80 x 25mm unit rated at 47 cfm @ 4000 rpm, 40 dBA. I found it to be tolerably quiet – I measured its noise (note that manufacturers measure noise 3′ from the fan) at 62 dBA with a Radio Shack sound meter 8″ from the fan’s intake, somewhat less than a Delta 38 (about 69 dBA). It’s also safe to use a motherboard fan header (6.1 watts).


I tested the TOCOOLS Regal 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

36.5 C

23.4 C



31 C¹

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