Dell OptiPlex XE (Early 2010) - Manual (Page 21)

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System Board Layout
Dell™ OptiPlex™ XE Service Manual— Small Form Factor
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1 processor power connector (12VPOWER) 2 processor connector (CPU)
3 memory module connectors (DIMM_4) 4 memory module connectors (DIMM_2)
5 memory module connectors (DIMM_3) 6 memory module connectors (DIMM_1)
7 battery socket (BATTERY) 8 password jumper (PSWD)
9 SATA drive connectors (SATA0) 10 SATA drive connectors (SATA1)
11 SATA drive connectors (SATA2) 12 thermal sensor connector (back)
13 front-panel connector (FRONTPANEL) 14 external power USB connector
15 internal USB connector 16 power connector (POWER)
17 serial port jumper (J3 and J4) 18 power connector (24V POWER)
19 serial port jumper (J1 and J2) 20 PCI Express x16 card connector (SLOT1)
21 PCI card connectors (SLOT2) - half height 22 intruder switch cable connector (INTRUDER)
23 RTC reset jumper (RTCRST) 24 internal buzzer (SPKR)
25 fan connector (FAN_HDD) 26 speaker connector (INT_SPKR)
27 thermal sensor connector (front) 28 fan connector (FAN_CPU)
29 wireless card connector (SLOT6)