Originally Posted by Kiwijunglist
I've seen quite a few posts asking about the fan control on the GA-Z77X-UD5H motherboard
If you install speed fan then
Fan 1 - CPU ; Monitor RPM + Control
Fan 2 - SYS1 ; Monitor RPM + Control
Fan 3 - SYS2 ; Monitor RPM only
Fan 4 - SYS3 ; Monitor RPM only
Fan 5 - N/A
PWM1 - CPU
PWM2 - SYS1 (This can control the speed of both PWM and 3 pin fans using voltage control)
PWM3 - CPU
You have to enable speed control in the advanced features-chip-ITF8728F. I like to set PWM1 + PWM2 = Software Control and PWM3 = Smart Guardian. Remember to tick Remember settings for each of the PWM controls.
If you install easy tune 6 you can also only control CPU + SYS1 fan, even with the latest update.
I have not checked which SYS headers are effected via bios settings
Pwm2 controller actually controls Sys_fan headers 1,2 & 3. In this example header 1 runs a Silverstone AP181 fan, header2 is running an Akasa Apache PWM fan and header 3 is running a Swiftech MCP35X PWM controlled pump.