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Should've put the heat gun on the 12V-2x6. Not the comb. The switch is insulated inside the comb for a reason. That's why it took so long for it to switch the GPU off with the heat gun because the heat had to permeate the comb to get to the switch. If simply heating up the comb affected the...
Because at lower RPM's you get an electrical noise that is even less desirable than fan noise (like a "click click click" noise). The solution to this (low RPM with no electrical noise) is a PWM fan. But, of course, those are much more expensive.