Pairing PWM
Moderators: NeilBlanchard, Ralf Hutter, sthayashi, Lawrence Lee
Pairing PWM
I want to run two PWM fans at the exact same speed. I notice there are "PWM splitters", but I wonder what that does to the RPM and PWM signals. Obviously it can't give both RPMs, so is the result whichever is higher? An average of the two? And what happens with the PWM signal?
PWM splitter cables have one socket wired with all four wires including fan speed sensing, and the other(s) with only three without fan speed sensing. So only one fan supplies information about its speed, which is normally the CPU fan. The PWM signal is based on duty cycle %, so for two identical fans they should both run at effectively the same speed.