NOTE: Shared slots have card compatibility restrictions. If one of the shared slots is occupied,
the card added to the second slot is limited by the configuration of the occupied slot. If the
new card has a slower capability than the current bus configuration, it fails. If the new card
has a faster capability than the current bus configuration, it only runs at the slower bus mode
and frequency of the current bus configuration.
The following are common configuration scenarios for cards that use shared slots. These
examples also apply to slots 9 and 10 because they are shared (both use a common bus).
1. If there is a PCI-X 66 MHz card in slot 7, and you hot-plug insert a PCI 33 MHz card into
slot 8, the operation fails. The new PCI 33 MHz card does not initialize and the slot
powers down because you cannot change bus speed during hot-pluggable operations.
The new card has a slower bus speed than the current card.
NOTE: If the server is rebooted in the new configuration, both cards initialize to run at
PCI 33 MHz. This is because the system firmware can only change the bus capability
down to the lowest common value.
2. If there is a PCI 33 MHz card in slot 7, and you hot-plug insert a PCI-X 66 MHz card into
slot 8, the new card works but it runs at PCI 33 MHz.
3. If the server is powered off and you insert a PCI 33 MHz card into slot 7 with a PCI-X 66
MHz card is installed in slot 8), then both cards run at PCI 33 MHz when the server
powers up.
The following describes configuration requirements for slots one through ten on the PCI/PCI-X/PCIe
I/O backplane:
• PCI-X slots 1 and 2 are reserved for use by the core I/O cards SAS core I/O card in slot 1
and Gigabit Ethernet LAN core I/O card in slot 2. Slots 1 and 2 are not hot-pluggable. Install
only supported SAS and LAN core I/O cards in slots 1 and 2.
• Slots 3 and 4 are swtiched PCIe x8
• Slots 5 and 6 are nonswitched PCIe x8.
• Slots 7 and 8 are nonshared slots. The maximum speed for cards in slots 7 and 8 is PCI-X
133 MHz.
• Slots 9 and 10 are shared slots. These two slots are limited by bus mode or frequency-related
incompatibilities.
IMPORTANT: Slots 9 and 10 on the PCI/PCI-X/PCIe I/O backplane have the same
configuration limitations as slots 9 and 10 on the PCI/PCI-X/ I/O backplane.
Table 3 lists the PCI/PCI-X card slot frequency and bus mode compatibility for shared slots.
Installing Additional Components 19
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