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Configuring memory is a compromise between cost, total memory capacity, and memory bandwidth requirements. The
following may be used as guidelines:
Applications, in which large amounts of memory can substantially reduce I/O throughput, may be optimized for total
memory capacity and future capacity growth. (Case B)
Typical commercial applications, such as transaction processing (OLTP) and multi-user timesharing, usually operate
efficiently from cache and may not be materially affected by memory bandwidth. Memory configuration is a balance
between memory bandwidth and future capacity growth. (Case B)
Data mining can benefit from additional memory bandwidth. It is best to match the number of memory base modules
to the number of CPUs. (Case A)
The most demanding high-performance technical applications achieve a performance level that is directly proportional
to memory bandwidth. In these cases, configure two memory options per CPU. (Case A)
Memory Specification
800 MHz
1066 MHz
Use only with the indicated CPU Modules (mandatory)
Must be used
only with
EV7 1.15 GHz
(3X-KN72C-**)
May be used
with either
EV7 1.3 GHz
(3X-KN72D-**)
or
EV7 1.15 GHz
(3X-KN72C-**)
1-GB RDRAM Memory (4x256) Option
3X-MS7AB-BA
3X-MS7AC-BA
1-GB RDRAM Memory (1x256) RAID Option
3X-MS7AB-BC
3X-MS7AC-BC
2-GB RDRAM Memory (4x512) Option
3X-MS7AB-CA
3X-MS7AC-CA
2-GB RDRAM Memory (1x512) RAID Option
3X-MS7AB-CC
3X-MS7AC-CC
4-GB RDRAM Memory (4x1024) Option
3X-MS7AB-DB
3X-MS7AC-DA
4-GB RDRAM Memory (1x1024) RAID Option
3X-MS7AB-DD
3X-MS7AC-DC
Step 5 - System I/O Expansion - Mandatory
Configuration Guidelines
Each AlphaServer GS1280 system requires one I/O Master Building Block Drawer per system. Additional I/O Building
Block Drawers are optional.
Each additional hard partition in the system requires:
One Standard I/O Drawer (Master or Expansion), or
Shared (up to four hard partitions) access to one High Performance I/O Drawer (Master or Expansion)
Each CPU in a GS1280 System Building Block Drawer can provide one I/O connection to an I/O Drawer.
Either a Standard I/O Drawer (Expansion or Master) or High Performance I/O Drawer (Expansion or Master) can be
used for optional I/O expansion. Any combination of drawers is supported up to the I/O connection limit of 32 per hard
partition or 64 per system with 2 or more hard partitions.
The Standard I/O Drawer requires one I/O connection.
The High Performance I/O Drawer requires one and optionally up to four connections.
Example - AlphaServer GS1280 Model 16 with 12 processors
Twelve Processors, one I/O connection each
=12 I/O connections available
Six Standard I/O Drawers, one I/O connection each
= 6 I/O connections
One High Performance I/O Drawer with four I/O connections
= 4 I/O connections
One High Performance I/O Drawer with two I/O connections
= 2 I/O connections
QuickSpecs
HP AlphaServer GS1280 Systems
GS Options
DA - 11921 Worldwide — Version 24 — July 23, 2007
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