Dell PowerEdge R905 - Manual (Page 81)

Installing System Components
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5 Open the expansion-card retainer and remove the filler bracket. See
Figure 3-11.
6 Install the expansion card:
a Holding the card by its edges, position the card so that the card-edge
connector aligns with the expansion-card connector on the system
board.
NOTICE:
If you are installing a SAS RAID controller card, do not press on the
memory module when installing the card.
b Insert the card-edge connector firmly into the expansion-card
connector until the card is fully seated.
c Close the expansion-card retainer. See Figure 3-11.