HP rx2600 Overview page 16

• The HP zx1 Chipset I/O adapter chip is a scalable solution designed to support PCI-X, PCI, and AGP bus
architectures. It provides a scalable I/O implementation for a wide variety of systems. The rx2600, rx4640,
and rx5670 do not deploy AGP graphics bus technology. AGP is available in the HP Workstations zx2000
and zx6000, which also employ the HP zx1 Chipset.
• The HP zx1 Chipset scalable memory expander is an optional component used to increase memory capacity
and increase memory bandwidth. Acting as a memory hub, it decreases the number of signal loads on the
memory bus, thereby allowing the system to increase its memory transfer rate. Memory expanders are not used
in the rx2600. The rx4640, however, deploys 6 memory expanders, resulting in large memory capacity (up to
64 GB over 32 DIMM slots) and bandwidth (12.8 GB/s). Likewise, the rx5670 uses 12 memory expanders on
two memory carriers to provide an exceptional memory capacity of 96 GB (over 48 DIMMs) with 12.8 GB/s
bandwidth.
Figure 7. The HP zx1 Chipset consists of three components
HP zx1 Chipset components
zx1
• HP zx1 memory and I/O controller
MIO
– Connects to processor bus
– Contains memory controller
– Contains I/O cache controller
• HP zx1 I/O adapter—a single
zx1
I/O adapter that supports:
IOA
– PCI
PCI X
–
– AGP
• HP zx1 scalable memory expander—
zx1
an optional component used to:
SME
– –
Increase memory capacity
– Increase memory bandwidth
The HP zx1 Chipset was designed with several goals in mind:
• Provide the best performance—for demanding applications that don't fit within the processor cache, the
memory system design is the key to performance. The HP zx1 Chipset's memory bandwidth has been optimized
with dual memory controllers to provide from 8.5 to 12.6 GB/s of memory bandwidth with 80 to 105
nanoseconds of open page latency.
• Provide the right functionality—including both memory capability and PCI-X support.
– At 12 GB, 64 GB and 96 GB, respectively, the rx2600, rx4640 and rx5670 provide enough memory
capacity for the most demanding tasks.
– The rx2600, rx4640, and rx5670 support 133 MHz PCI-X buses capable of handling the latest generation
of high-speed I/O adapters.·
• Enable a family of systems via a modular, multi-chip design—designers can choose the chipset components
they need and select the number of these components to meet system cost and design requirements. For
example, the more expandable HP Integrity rx4640 and rx5670 servers deploy HP zx1 Chipset scalable
memory expanders for greater memory capacity. The rx2600, on the other hand, does not deploy zx1 scalable
memory expanders, resulting in lower system costs.
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