ASUS X570-E cooling connectors
ASUS X570-E cooling connectors
I'm planning to install the ASUS Strix X570-E and will be pairing it with a Phanteks P400A-Digital and a Noctua NHU12S. The guide suggests using the CPU_FAN headers for the Noctua and case fans in CHA_FAN. For the third case fan, I need to figure out where to connect it since the manual only lists two headers. The M.2_FAN header should work if you're using a M.2 fan, but I'm not sure if it's compatible with this build.
Look for a simple PWM splitter that has solid feedback. They usually cost around $3 or less.