Dell Vostro 430 (Late 2009) - Manual (Page 46)

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System-Board Layout
Dell™ Vostro™ 430 Service Manual
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1 front I/O panel connector 2 SPDIF out connector
3 USB2 connector (from front I/O panel) 4 USB1 connector (from front I/O panel)
5 USB3 system-board connector 6 Clear CMOS jumper
7 PCI connector (PCI1) 8 PCI connector (PCI2)
9 front audio connector 10 CMOS battery
11 PCI Express x1 connector (PCIE_x1) 12 PCI Express x16 connector (PCIE_x16)
13 audio connector 14 network connector and USB connectors (2)
15 USB connectors (4) 16 serial connector
17 PS/2 mouse and keyboard connectors 18 power connector (PWR2)
19 Clear Password jumper 20 processor socket
21 processor-fan power connector 22 memory slot (DIMM1)
23 memory slot (DIMM2) 24 memory slot (DIMM3)
25 memory slot (DIMM4) 26 main power connector (PWR1)
27 NVRAM slot 28
serial ATA hard drive connector
(SATA1,SATA2,SATA3, and SATA4)