EVGA X299 FTW-K User Manual page 44

EVGA X299 FTW - K (142-SX-E297)
The motherboard contains 2x 9-pin internal header connectors onboard that
can be used to connect an optional external bracket containing up to four (4)
USB 2.0 ports.
Secure the bracket to either the front or rear panel of your chassis (not
all chassis are equipped with the front panel option).
Connect the end(s) of the cables to the USB 2.0 headers on the
motherboard.
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