Lenovo H520s Desktop - Manual (Page 29)

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User Guide
4.1.2 Identifying parts on the system board
The system board (sometimes called the planar or motherboard) is the main circuit
board in your computer. It provides basic computer functions and supports a
variety of devices that are factory-installed or that you can install later.
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12V power connector Microprocessor and heat sink
Microprocessor fan header Memory slots (2)
Thermal sensor header Power connector
Battery SATA connectors (3)
eSATA connector Power fan header
Front panel connector Clear CMOS jumper
Front USB connectors (2) Mini PCI-E slot
Mode switch connector Serial (COM2) connector