Dell 3 - Manual (Page 113)

PERC 3/SC Hardware Installation 111
Step 5—Install PERC 3/SC
Choose a 3.3 V or 5 V PCI slot and align the PERC 3/SC card bus connector
to the slot. Press down gently but firmly to make sure that the card is
properly seated in the slot. The bottom edge of the controller card should
be flush with the slot. Figure 8-4 shows PCI slots on a motherboard.
F i g u r e 8 - 4 . P C I S l o t s o n M o t h e r b o a r d