Dell Dimension 9150 - Manual (Page 87)

Removing and Installing Parts
87
4 Push the two release tabs on the card retention door toward each other and pivot the door
open. Because the door is captive, it will remain in the open position.
5 If your computer includes a card retention mechanism, to remove the x16 card:
a Pivot the mechanism upward and gently squeeze in on the sides to release the
mechanism from the two tab slots holding it in place.
b Set the retention mechanism aside in a secure location.
NOTE:
For full-length PCI-E cards, if a "piano" bracket is present on your computer you need to rotate it
upward by pressing the tabs on the side of the bracket toward each other.
card retention
door release tab card retention mechanism
*"piano" bracket
*may not be present on all computers
PCI Express
x16 card
PCI Express x16
card slot
PCI Express x1
card
PCI Express x1
card slot
securing tab