Of course, the standard way of controlling CPU fans these days is with PWM, so he built a circuit which essentially converts the PWM signal from the motherboard into a phantom thermistor.

Without fan curve manipulation, the fan starts at 250 RPM and gets near 1800 RPM when maxed out. Wiring is handled through daisy-chain 4-pin PWM fan connections, and doing the math, that MTBF ...