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The Cool Master Geminii Low Profile M4 cooler arrived today so despite the bad reviews (which I found after I bought it) I have done some testing with it. The heat sink itself is pretty good, and cools off very quickly with the fan at top speed. The fan however, it rubbish, it vibrates badly (transmitting to the TEC mount and ulimately to the camera sensor), even with rubber feet on the heatsink. The fan feels like it has an eccentric wobble somewhere.
I did a side by side comparison test with my old Deep Cool Gammaxx 200 on the colour camera and the Deep Cool produces no vibration through to the cold finger (due in part to the great bearing on the fan and some to the silicon mounting pads). Hard to believe there was only a couple of dollars difference in price, but I guess if its inside a Computer case people don't care to much about vibration. In a year of shooting with the colour camera at sub lengths up to ten minutes there has been no sign of vibration 'fuzziness' getting to the image - its that good.
So the Cool Master heat sink might be usable but the fan is going to be replaced if I use the heat sink on this or some other project.
A couple of photos attached, the side by side profile shows what I was trying to achieve with a low profile heat pipe - reduce the mass and bring it closer to the camera centreline.
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