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ATTECH (Advanced Thermal Technologies) is a relatively new company (formed in December 1998). They specialize in producing copper heatsink's for IC packages and CPU's.

Today we're looking at their CM25 Socket-370 Cooler which is comprised of a 15mm dense-finned copper heatsink and a low-profile fan. The main pull behind this cooler is it's very compact nature making it useful for tight operation such as flexATX/microATX or book sized PC's.

Here are the complete specs of the CM25, as well as those of Thermaltake's Golden Orb, for comparison purposes:

CM25 Golden Orb
Heatsink Material Copper Aluminum 6030
Ambient Temperature 45J   Unknown
Heat Sink Dimensions 62x51x15mm  69dia x 45 mm tall
Thermal Resistance 1.1J /W 0.98c/w
Fan Dimensions 50x50x15mm
50x50x20mm (CoolerGuys)
Rated Voltage 12VDC 12 volts
Rated Speed 6400RPM (standard)  4500 RPM
Air Flow 16.24CFM
20 CFM
Noise Level 36dB(A) (standard) 26 dBA
Cooler Weight 200g 5% Unknown
Clip Type Standard (Pressure Mount) TCS01 Twist on Clip
Interface Socket-370/A Socket-370

Comparing the specs, the first thing you'll probably notice is the poor fan on the CM25.  Being that thin comes at a price: Lower air movement.  Fortunately, the CoolerGuys purchased the heatsinks alone and have outfitted them with more powerful fans.  

Even if the CoolerGuys fan is not good enough, the heatsink is versatile enough so that you can add almost any fan you like, giving it even more cooling potential.  As you can see from the picture on the left, the fins are extremely dense and the entire thing is made out of Copper which is one of the best conductors of heat and electricity and doesn't cost a whole lot to manufacture.


The CM25 uses one of those standard spring like clamps in which you hook one side in and push down really hard on the other side and somehow try to get it under the other hook.  When you're dealing with a Slocket, it's not so bad, because you have a lot more room, but when you're working with a socket on the motherboard itself and the motherboard being mounted inside the case, it becomes extremely difficult and frustrating.  Thermaltake tried to remedy the situation by making a different type of mounting device in which you hook on both sides without any pressure, then you turn the heatsink and it's supposed to lock itself that way.  It's a good idea, but damn scary because of the pressure required to turn it fully. 

So, after nearly ripping the skin of my fingers, I have come to the conclusion that I hate Socketed CPU's and heatsinks and I wish they had stuck with the Slot format, which I oh so dearly miss! 

Let's get on with the tests, shall we?

Next Page: Temperature Tests & Conclusion

Review Index:
Page 1 - Introduction& Specifications
Page 2 -
Tests & Conclusion

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