Dell Precision 620 - Manual (Page 9)

Expansion Cards
The computer system accommodates up to six expansion cards (two 64-bit and four 32-bit PCI expansion cards), one 32-bit AGP Pro card, and
one 32-bit PCI/redundant array of independent disks (RAID) port. See Figure 2 for examples of the expansion cards.
Figure 2. Expansion Cards
Expansion Slots
The Dell Precision 620 system provides six PCI 2.2-compliant expansion slots on two peer buses. Four 32-bit slots (1, 2, 3, and 4) are on the
primary PCI bus. One or two of these slots may be used with the AGP Pro connector. Slot 4 is shared with the RAID port function. Two 64-bit slots
(5 and 6) are on the secondary PCI bus.
You can install a properly keyed universal PCI expansion card in either the 32-bit (5-volt [V], 33-megahertz [MHz]) or 64-bit (3.3-V, 66- or 33-MHz)
PCI expansion slots. Either of the 64-bit expansion slots will accept a properly keyed 32-bit expansion card without affecting the other 64-bit
expansion slot; however, if you install a 33-MHz expansion card in either 64-bit expansion slot, the other 64-bit expansion slot operates at 33 MHz
also.
Installing an Expansion Card
1. Prepare the expansion card for installation, and remove the computer cover .
See the documentation that came with the expansion card for information on configuring the card, making internal connections, and
customizing it for your system.
12 Processor mismatch LED 33 32-bit PCI expansion-card connectors (3)
13 Memory expansion card B connector 34 AGP Pro graphics card connector
14 System board thumbscrew 35 Network connector
15 Suspend to RAM LED 36 Diagnostic LEDs
16 Memory expansion-card A connector 37 USB connectors
17 LVD SCSI connector 38 Microphone, audio- in, and audio-out connectors
18 Standby power LED 39 Keyboard and mouse connectors
19 Memory expansion-card mismatch LED 40 System fan connector
20 Control panel connector 41 Serial port connectors 1 and 2
21 Remote wakeup LAN connector 42 Parallel port and SCSI port connectors
1 64-bit PCI expansion card
2 32-bit PCI expansion card
3 32-bit AGP expansion card
NOTE: There are no Industry-Standard Architecture (ISA) slots provided.
NOTE: If you install a PCI expansion card, your system automatically performs any required configuration tasks during the boot routine.
NOTICE: See "Protecting Against Electrostatic Discharge" in your Dell Precision WorkStations System Information Guide.
CAUTION: Some network cards automatically start up the system when they are connected. To guard against electrical
shock and to avoid damaging electrical components, perform the following steps before you install any expansion
cards:
a. Disconnect the external power cable at the back of the system.
b. Disconnect any network cables and phone lines.