HP ProLiant DL585 G5/G6 server technology

will clock down in order to compensate for the additional load. Table 1 lists available memory
configurations for the DL585.
Table 1. Memory configuration options in the DL585 G5 & G6
DIMMs per processor Maximum memory speed
2, 4 800 MHz
6 667 MHz
8 533 MHz
I/O technologies
The DL585 supports two types of I/O expansion slots: PCI-X and PCI Express. The server includes two
64-bit, 100-MHz, PCI-X slots (one full-length, one half-length) that provide a 64-bit, 100-MHz interface
for expansion devices.
PCI Express (PCIe) is an expansion bus technology that builds upon earlier PCI technology, but it uses
a serial interface rather than the traditional parallel PCI bus. A PCIe interface can support one or
more lanes, as determined by the PCIe slot. Multiple-lane connections are described as x4 for a
4-lane connection, x8 for an 8-lane connection, and so forth. Each lane is a separate serial
connection of four wires and has a bandwidth of 250 MB/s in each direction (for a total bandwidth
of 500 MB/s per single PCIe lane link). PCIe links automatically negotiate the highest number of lanes
that the slot and the card support. Therefore, a PCIe expansion card can be installed into any slot in
which it will physically fit and it will work correctly.
The DL585 has seven standard PCIe slots: three full-length x8 slots, three full-length x4 slots, and one
half-length x4 slot. Since PCIe interface handling is split 4/3 between the two processor pairs and
their associated chipsets, optimal performance can be achieved by balancing the load of multiple
PCIe expansion cards across the HyperTransport links. Table 2 identifies the preferred installation
order.
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