HWMonitor/Speedfan not reading PWM fans

Calneon · 17 Dec 2013 at 18:05

I have a Gigabyte Z87X-OC with 4 PWM fans attached to 4 PWM fan headers. They're working fine, can hear them speed up when CPU temp increases, but neither HWMonitor or Speedfan pick them up. They both see two fans that hover around 1000 RPM (no matter what temp) and three fans on 0.

Anyone know why this could be?

Calneon · 17 Dec 2013 at 21:52

You're right, I have one fan plugged into CPU_OPT (pump is in CPU_FAN). That one increases and that's what I'm hearing, other others in the SYS_FAN ones don't speed up. I thought they were based on CPU too?

I have a 5 way splitter cable but it just runs every fan connected to it at max speed regardless of what the PWM is telling it...

Calneon · 17 Dec 2013 at 23:54

doyll said:
Many motherboard 4 pin fan headers are not PWM. Often the only ones that are PWM are
The CPU fan and CPU opt.. and often they are both using same PWM control.

Even if in the BIOS it lets you set the speed of those fan headers?

Calneon · 18 Dec 2013 at 11:11

Same deal in CPU_FAN and CPU_OPT. I'm also not sure why HWMonitor doesn't display CPU_FAN and CPU_OPT, and only shows 2 SYS_FANs when I have three plugged in...