Lenovo ThinkStation P620 Hardware Maintenance Manual page 98

Figure 2. PCIe card installation order
For access, do the following:
1. Remove the computer cover. See "Computer cover" on page 58.
2. Lay the computer on its side for easier access to the system board.
3. Remove the power cable from the PCIe card, if any.
Removal steps
Note: The PCIe card retainer is only available on some models.
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P620 Hardware Maintenance Manual