Dell Precision T3400 (Late 2007) - Manual (Page 171)

Adding and Replacing Parts
171
7 Place the card in the connector and press down firmly.
Ensure that the card is fully seated in the slot, the top of the card is flush
with the alignment bar, and the notch in the top of the card fits around the
alignment guide.
1 screws (2) 2 second hard drive bracket
2
1