Dell Precision WorkStation 420 Service Manual page 37

Figure 21 shows the AGP card extension that occludes 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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One AGP Pro110 card and three PCI cards
One AGP Pro110 card, two 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
Remove the computer cover.
1.
2. Rotate the power supply away from the system board.
3. Remove the AGP card brace.
4. Disconnect any cables connected to the card.
5. Unscrew the mounting bracket screw of the card you want to remove.
6. Grasp the card by its outside corners, and ease it out of its connector.
7. 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.
Expansion-Card Installation
To install a replacement expansion card, perform the following steps.
CAUTION: Before you remove the computer cover, see
1. Remove the computer cover.
2. Rotate the power supply away from the system board.
3. Prepare the card as necessary, using the instructions provided with the card.
4. Insert the expansion card into the expansion-card connector.
5. If the expansion card is full-length, insert the front end of the card into the corresponding card guide on the inside front of the chassis as you
insert the card into its connector. Insert the card's edge connector firmly into the expansion-card slot. Gently press the card into the connector
until it is fully seated (see Figure 22).
"Precautionary Measures."
"Precautionary Measures."