Asus H81M-CS Manual page 23

3. CPU and chassis fan connectors (4-pin CPU_FAN, 4-pin CHA_FAN)
black wire of each cable matches the ground pin of the connector.
H81M-CS
H81M-CS Fan connectors
4. USB 2.0 connectors (10-1 pin USB910, USB56)
H81M-CS
H81M-CS USB2.0 connectors
ASUS H81M-CS
CPU_FAN
CHA_FAN
GND
CHA FAN PWR
CHA FAN IN
+5V
USB56 USB910
PIN 1 PIN 1
1-15