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Originally Posted by Cartwheels
Update: While I had my Quark apart I decided to go ahead and remove aluminum spacer between the heatsink and the fets. It was held on with a thermal pad. It was only half stuck on. You could tell that dust had gotten to the thermal pad. Half the pad was covered with dust and the other half was stuck on well.
My plan was to put it back together and substitute thermal epoxy for the heat pads. The epoxy is much thinner so I had to carve out some space for the caps in the heatsink otherwise they would prevent the fets and the heatsinks from fitting flush. I also had to trim some of the plastic under where the phase wires come out for the same reason. I've got it all back together and have not run it yet, but I expect it to run at least a little cooler. I had 3 fans on it before and it was still thermaling.
In conclusion, I think the thermal pads can contribute to some of the thermal problems with the Quark. The sticky part of those pads just can't hold up to the rough, hot, dusty environment and will fail eventually. Not to mention the heat has to transfer through 2 of those pads to get to the real heatsink!
The real test will come when I run it again. It my be a week or two before I can run it again.
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Have you tried it out yet?