IBM 71413SU - System x3950 M2 Reference page 33

As shown in Figure 15, there are seven PCI Express x8 slots. Slots 6 and 7 support hot-plug
PCI Express adapters.
SAS
backplane
signal
Remote
Supervisor
Adapter II
System
Management
access
Battery
Front USB
Figure 15 PCI Express slots
Note the following configuration information:
Full-length cards are not supported. Half-length cards
Video adapters are not supported.
The PCI Express slots support x4 or x8 PCI Express adapters only.
It is recommended that for performance reasons, you do not install more than two high
speed (that is, 8 Gbps or faster) PCI Express cards per PCI bridge (bridge 1 is slots 1, 2, 3
and 4; bridge 2 is slots 5, 6, and 7) with a maximum of four per system. Examples of
adapter cards that have bandwidth maximums of 8 Gbps or more include 10 Gbps
Ethernet card and dual-port 4 Gbps Fibre Channel cards.
Remote Supervisor Adapter II
Internal USB
ServeRAID-MR10K
SAS backplane power
Front panel/light path diagnostics
DVD
IBM System x3950 M2 and x3850 M2 Technical Introduction
Hot-plug switch card
PCI Express x8
(x8 lanes) slot 1
PCI Express x8
(x8 lanes) slot 2
PCI Express x8
(x8 lanes) slot 3
PCI Express x8
(x8 lanes) slot 4
PCI Express x8
(x8 lanes) slot 5
PCI Express x8
(x8 lanes) slot 6
PCI Express x8
(x8 lanes) slot 7
are
supported, however.
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