|IMBA-Q870-i2-R10 - Why SYS_FAN1 doesnt' start/spinning sometimes perhaps SYS_FAN2 is always spinnin?|
|This is normal because SYS_FAN1 is controlled by iWDD in BIOS for Smart-functions sensing based on system's environments.|
|SYS_FAN1 can rotate when system/chassis goes beyond some temperature level ~40 deg C, otherwise it will be stop rotating and this can be monitored and viewed in BIOS under iWDD hardware monitor.|
SYS_FAN2 is connected by Vcc to run always!
CPU_FAN is separated than above SYS_FAN's.
This condition is applied for most of ATX-motherboards from IEI!