Abit AT7 User Manual page 21

Installing the Motherboard
(4). TCPU1 & TSYS1: Temperature Thermistor
(5). USB3 and USB4 Headers: Additional USB Plugs Header
The USB4 header supports USB 2.0 specification function, please use the special USB cable design
for USB 2.0 specifications. Otherwise, it may cause not stable or signal error situation.
The TCPU1 is used to detect the CPU temperature.
The TSYS1 is used to detect the system
environment temperature. You can see the readings
in the BIOS or in the hardware monitoring
application main screen.
Thess headers are for connecting the additional USB
port plugs. Each connector can provides two
additional USB plugs. Which means, total you can
get two additional USB plugs from each connector.
You can use the special USB port expansion cable
to connect it (the cable come with the metal plate
can fixed on the back panel of computer chassis).
The USB3 is for USB 1.1 devices connection, and
USB4 is for USB 2.0 devices connection.
Note: Watch the pin position and the orientation
Note
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User's Manual