Dell Precision 420 - Manual (Page 9)

Expansion Cards
The system contains five 32-bit PCI expansion slots (one shared with the RAID slot) and one 32-bit AGP Pro50 (4X) slot (desktop chassis) or one
AGP Pro110 (4X) slot (mini tower chassis). If you use an AGP Pro110 or Pro50 card, it occupies the AGP slot and may occupy PCI slots 1 and 2.
See Figure 2 and
Figure 3 for examples of the cards that occupy these slots.
Figure 2. Expansion Cards
Figure 3. AGP Pro110 or Pro50 Card
12 LVD SCSI connector
13 Primary EIDE connector
14 Standby power LED
15 Control panel connector
16 Power connector (mini tower chassis)
17 Power connector (mini tower chassis)
18 TAPI/modem connector
19 Card cage area fan connector
20 Auxiliary sound input connector
21 PCI/RAID expansion card slot
22 Auxiliary hard-disk drive access LED connector
23 PCI expansion slots
24 AGP Pro50 (4X) graphics slot (desktop chassis), or AGP
Pro110 (4X) graphics slot (mini tower chassis)
25 Wake on LAN connector
26 Processor 0
27 Network cable connector
28 Diagnostic LEDs
29 USB connectors
30 Processor 1
31 Line-in connector
32 Line-out connector
33 Microphone connector
34 Mouse/Keyboard (stacked)
35 System fan connector
36 Serial port 1/serial port 2 (stacked)
37 Parallel port/external SCSI port (stacked)
1 32-bit PCI expansion card
2 32-bit AGP card