I just purchased a Fractal Design Celsius S24 240mm AIO cooler, it has a single 4-pin PWM cable that powers the pump and fans out to control the 2 fans. I assumed it makes sense, running from a single cable, nice and tidy, so the pump runs at full speed/12V (ignores PWM signal) and the PWM signal is passed on to the fans but just read from the blurb: "...Both fan and pump speeds can be managed by an intelligent auto mode or switched to PWM mode for precise user control. " Does this make sense to you lot? Since the pump and fans are controlled by the same PWM signal then the pump speed cannot be separately set to 12v, a bit of a flaw. I always thought the pump should run at full speed and then control the fans or is it ok to tweak the pump speed too now?