Dell 3 - Manual (Page 145)

PERC 3/QC Hardware Installation 143
Step 5—Install PERC 3/QC
Choose a 3.3 V or 5 V PCI slot and align the PERC 3/QC 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 10-5 displays the PCI slots on a motherboard.
F i g u r e 1 0 - 5 . P C I S l o t s o n M o t h e r b o a r d