Are they PWM (4 pin) or DC (three pin)? If all three fans are identical, it's not much of an issue. For PWM fans they take the tach reading from one fan and send the PWM signal equally to all on the splitter. I personally would have them broken up by location (front, back, and AIO [or CPU/Alt] for the cooler. then you can adjust as necessary to achieve optimum pressure differential. But it's really just for playing around with the fan curve in FanXpert. Sounds nice to hear the fans start cranking up when doing benchmarks, etc...