Lenovo ThinkStation C20 User Manual page 16

Figure 4. System board part and connector locations
1
CPU 1 memory slots (6)
2
CPU 1 memory fan connector
3
CPU 2 12 V power connector
4
Microprocessor 2
5
24-pin power connector
6
CPU 2 fan connector
7
CPU 2 memory fan connector
8
CPU 2 memory slots (6)
9
Power switch and LEDs connector
10
Auxiliary LED connector
11
Right rear fan connector
12
Front fan connector
13
Card reader connector
14
Front USB connector
15
Front IEEE 1394 connector
16
Hard disk drive connectors (5)
17
Optical drive connectors (3)
18
Battery
10
ThinkStation User Guide
35
34
33
32
31
19
Clear Complementary Metal Oxide Semiconductor
(CMOS) /Recovery jumper
20
Thermal sensor connector
21
Cover presence switch connector
22
Personal System/2 (PS/2) keyboard and mouse connector
23
Internal speaker connector
24
Front audio connector
25
PCI card slot
26
PCI Express x4 card slot (x16 mechanical)
27
PCI Express x16 card slot
28
PCI card slot
29
PCI Express x16 card slot
30
PCI Express x1 card slot
31
Auxiliary 12 V power connector
32
Left rear fan connector
33
CPU 1 12 V power connector
34
CPU 1 fan connector
35
Microprocessor 1