Dell PowerEdge M620 Owner's Manual page 54

support quad-port mapping. This behavior is limited to Fabric A slots only
and is automatically enabled or disabled depending on the type of IO module
installed.
NOTE:
A quad-port Network Daughter Card must be used with a 48-port switch
module (32 internal ports) for all the ports to be active.
NOTE:
LOM firmware updates are applied only to the enabled ports on a quad-port
network daughter card.
Table 1-12 provides an overview of the configurations that enable/disable the
NIC3 and NIC4 ports of a quad-port Network Daughter Card.
Table 1-12. Port Auto-Disablement Decision Table
IOM Slot A1
Empty
Empty
Empty
Dual Port
Dual Port
Dual Port
Quad or Greater
Port
Quad or Greater
Port
Quad or Greater
Port
54
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IOM Slot A2
Empty
Dual Port
Quad or Greater
Port
Empty
Dual Port
Quad or Greater
Port
Empty
Dual Port
Quad or Greater
Port
NIC3 and NIC4
(Enabled/Disabled)
Enabled
Disabled
Enabled
Disabled
Disabled
Enabled
Enabled
Enabled
Enabled
Port Auto-
Disablement
Inactive
Active
Inactive
Active
Active
Inactive
Inactive
Inactive
Inactive