Speeze 5R265B1H3

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Good performance at reasonable noise levels – Joe

SUMMARY: Very good cooling in a small package.


Size: 60 x 62 x 53mm high; Weight: 265 grams; Fan: 22 cfm @ 4800 rpm, 30 dBA.

The good guys at Speeze were nice enough to send over a sample of their Socket A/370 heatsink, the Speeze 5R265B1H3. This is an aluminum skived fin unit with a copper plug in the base. The base measures a hefty 14mm thick.

The fan is a FTC (Fanner Tech) Model # FD06010B1H – an 60 x 10mm unit rated at 22 cfm @ 4800 rpm, 30 dBA¹. I found it to be tolerably quiet – I measured its noise at 58 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 – 3.4 watts.

The plug (30mm diameter, 7mm thick) is flat and well finished:


When I ran my nail over it, I could not feel any polishing ridges, although you can hear them – they are very fine.

The clip requires a screwdriver to mount on the socket and is fairly stiff, which no doubt helps performance.


The Speeze was first tested on the CPU Die Simulator which gives results that are unaffected by motherboard influences. I then tested it on a Shuttle AK31, modified to read AMD’s on-die diode, as an example of what users might see on their systems.


Die Temp
Ambient Temp
Speeze, 5190 rpm
47.9 C
21.9 C
26.0 C

TEST RESULTS – Motherboard

CPU Die Temp

Ambient Temp



CPU Temp

XP @ 1467, Shuttle AK31

44.3 C

21.3 C



42¹ C

¹In-socket thermistor per MBM

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

Interpreting C/W: For every watt (CPUw) that the CPU
consumes, the HSF will limit the CPU’s temperature rise to (C/W x CPUw)
plus the temperature at the HSF’s fan inlet. For example, at an ambient temp of 25 C, a C/W of 0.25 with a CPU radiating 50 watts means that CPU temp will increase 50 x 0.25 = 12.5 C over ambient temp, or 37.5 C. The lower the C/W, the better.

Die Simulator results place the Speeze in the upper rank of heatsinks tested to date (Heatsink Ranking).


Nice performance considering its size and relatively modest fan – this is a good solution for non-aggressive cooling.

Thanks again to Speeze for sending this our way.

¹Note that manufacturers measure fan noise usually 3 feet from the fan.

Email Joe


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