Global Win CDK38 Prototype

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Very competitive performance from an all copper forged heatsink. — Joe

SUMMARY: Good performance and why not? A proven design.


Dimensions: 63mm sq x 72mm high; Fan: 60mm Delta 38 or clone; Weight: about 440 gm.

The good guys at Global Win sent over a prototype of a new all copper, forged heatsink – model #CDK38. Forging is basically taking a chunk of metal and squishing it under pressure into a shape. The advantage for heatsinks is that there are no solder joints – it’s a solid piece of metal.

Alpha was one of the first to do this successfully, so the process is mature and the benefits are well known. Global Win’s entry may change somewhat from what you see here, but it is a nice product as is. The pins


are smooth – there are 225 of them. Airflow through the pins is relatively unimpeded, adding to secondary source cooling on the motherboard. Note that the base


is “traditional” – no slots or gaps to wash air over the CPU carrier. It is smooth to the touch although mottled in appearance – the production versions will most likely show more “polish”.

The fan looks and sounds like a Delta 38 (complete with black label) – I measured fan noise at 67 dBA (Radio Shack sound meter 8″ from fan intake).


The CDK38 was first tested on the CPU Die Simulator which gives results that are unaffected by motherboard influences. Tests then were conducted on a variety of motherboards as examples of what users might see on their systems.


Die Temp

Ambient Temp



Simulator, 77.2 Watts

49.4 C

20.2 C



TEST RESULTS – Motherboards

CPU Die Temp

Ambient Temp



CPU Back Temp

Palomino 1200/Iwill XP333 (56 watts)

37.0 C

20.4 C



39.0 C

Celeron 1.2 @ 1.6, Iwill BD133u (39 watts)

38.0 C

18.1 C




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

Interpreting C/W: For every watt the CPU radiates, the heatsink will cool the core by the (C/W x watts) plus ambient temp. For example, at an ambient temp of 25 C, a C/W of 0.25 with a CPU radiating 50 watts means that the CPU core temp will be 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 CDK38 in the upper ranks of heatsinks (Heatsink Ranking) – a very good showing.


Global Win’s CDK38 prototype, assuming the production version is the same, will be a good cooling choice, although at the expense of fan noise.

Thanks again to Global Win for sending this our way.

Email Joe

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