ASROCK phantom gaming Z790 PG LIGHTNING User Manual page 35

USB 2.0 Header
(9-pin USB_1_2) (see p.6, No. 23)
There is one header on this motherboard. This USB 2.0 header can support two
ports.
30
USB_1_2
USB_PWR
P-
P+
GND
DUMMY
1
GND
P+
P-
USB_PWR