Dell Precision WorkStation 420 Service Manual page 6

Figure 7. AGP Pro50 Card Extension
Figure 7 shows the card extension that may occupy PCI slots 1 and 2.
The following is a list of valid expansion-card combinations:
One AGP card and five PCI cards
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One AGP card, four PCI cards, and one RAID card
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One AGP Pro50 card and four PCI cards
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One AGP Pro50 card, three PCI cards, and one RAID card
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Expansion Card Removal
To remove an expansion card, perform the following steps.
CAUTION: Before you remove the computer cover, see
1. Remove the computer cover.
2. Disconnect any cables connected to the card.
3. Unscrew the mounting bracket of the card you want to remove.
4. Grasp the card by its outside corners, and ease it out of its connector.
5. If you are removing the card permanently, install a metal filler bracket over the empty card-slot opening.
NOTE: Installing filler brackets over empty card-slot openings is necessary to maintain Federal Communications Commission
(FCC) certification of the system. The brackets also keep dust and dirt out of your computer.
6. Replace the computer cover, and reconnect your computer and peripherals to their power sources and turn them on.
NOTE: After you remove and replace the cover, the chassis intrusion detector will cause the following message to be displayed at
the next system start-up:
ALERT! Cover was previously removed.
7. To reset the chassis intrusion detector, enter System Setup, select System Security, and reset Chassis Intrusion to Enabled or
Enabled-Silent.
1 32-bit PCI expansion card
2 32-bit AGP card
"Precautionary Measures."