Installation guide

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EMC Fibre Channel and iSCSI with QLogic HBAs in the Windows Environment
Installation and Configuration
denote the type of voltage is provided by the slot and effectively
prevent a voltage incompatible HBA from being inserted.
Figure 1-2 shows how PCI slots will appear with their keys and what
type of voltage is provided for each slot type.
Figure 1-2 PCI Slot types and voltage key locations
Figure 1-3 on page 1-7 shows the HBA edge connecters compatible
with the PCI slots shown in Figure 1. Note HBA #5 which shows a
universal HBA edge connecter. Universal HBAs are compatible with
both 3.3v and 5v PCI slots.