Hardware options installation 83
Slot Expansion
card type
Connector Capable speed
3 PCI-X 64-bit, 3.3-volt 100-MHz
4 PCI-X 64-bit, 3.3-volt 100-MHz
5 PCI Express * x8 x4
6 PCI Express * x8 x4
* x8 PCI Express cards are supported, but will run at x4 speeds.
Performance balancing
Balancing is the paired arrangement of expansion boards for optimal
performance based on the bus architecture of the expansion slots. When
populating boards on a shared bus, be sure that both boards operate at the same
speed (two PCI boards or two PCI-X boards). If boards with different speeds are
used, the bus performs at the speed of the slowest board. Performance balancing
is not necessary with PCI Express slots.
To balance expansion board performance, populate slots across different buses
before populating two slots on the same bus.
NOTE: The population order is only a recommendation. Expansion
boards can reside in any slot.
Slot Number Population Order PCI-X Bus Sharing
1 1 Slots 1 and 2 shared PCI-X bus
2 3 Slots 1 and 2 shared PCI-X bus
3 2 Slots 3 and 4 shared PCI-X bus
4 4 Slots 3 and 4 shared PCI-X bus
NOTE: The operating system detects expansion devices in the
following order: 1-2-3-4-5-6.
Removing the expansion slot cover
1. Power down the server ("Powering down the server" on page 27).
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