Quad-Peer Pci-X Architecture; Why Pci-X Faster Is Than Conventional Pci; Backward Compatibility And Bus Performance With Pci Cards - HP ML530 - ProLiant - 128 MB RAM Brief Manual

ProLiant ML530 High-Performance Technologies
quad-peer PCI-X
architecture
why PCI-X faster is
than conventional
PCI
backward
compatibility and
bus performance
with PCI cards
figure 11. internal storage in the ProLiant ML530 G2 server
The quad-peer PCI-X architecture consists of four 64-bit, 100-MHz PCI-X bus segments
controlled by two PCI-X Bridges. The first PCI-X bridge provides PCI-X Hot Plug capability
to slots 1 through 4. The second PCI-X bridge controls the third and fourth PCI-X bus
segments. Slots 5 and 6 are connected to the third bus, and slot 7 is connected to the
fourth PCI-X bus. Slot 7 should be used for Remote Insight Lights-Out Edition (RILOE)
support because it is the closest slot to the virtual power button cable connectors. Slots 1,
3, and 5 should be populated before slots 2, 4, and 6 are populated for two reasons: to
populate slots from the center of the server where the best cooling is available and to
balance the buses for better system performance.
Note: Since there are no PCI slots on the compatibility bus with the management
controller, the RILOE must be plugged into the management connector (or power button)
to enable remote power cycling (virtual power button).
PCI-X technology provides a significant improvement in performance beyond that of
conventional PCI systems. The performance improvements are a result of two primary
differences between conventional PCI and PCI-X: higher clock frequencies—made
possible by the register-to-register protocol—and new protocol enhancements such as the
attribute phase and split transactions. For more information on these performance
improvements, read PCI-X: An Evolution of the PCI Bus, document number TC990903TB,
available at http://thenew.hp.com.
The ProLiant ML530 G2 server supports the following adapter cards:
• 100-MHz PCI-X
• 66-MHz PCI-X
• 66-MHz PCI
• 33-MHz PCI
The ProLiant ML530 G2 server supports universal adapter cards and 3.3-V PCI cards;
however, it does not support 5 V-only PCI cards. The PCI-X slots are keyed so that
unsupported adapter cards cannot be inserted.
The PCI-X buses operate at a maximum speed of 100 MHz. The system automatically
adjusts the PCI-X bus frequency to match the frequency of the slowest adapter on that bus
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