Bull NovaScale T840, User Manual, Page: 32 / 302

User Guide
32
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Standard Features
Processor
The system board accommodates up to two Dual-Core or Quad-Core Intel
®
Xeon
®
processors with 2 MB L2 cache.
When two processors are installed, they are of identical revision, core voltage, and bus/
core speed. When only one CPU is installed, it must be in socket 1. No terminator is
required in the case of a single processor configuration.
Memory
The system board provides eight 184-pins DIMM slots each supporting DDR2 533 or
DDR2 667 ECC memory. You may install a minimum of 1 GB and as much as 16 GB
(8 x 2 GB).
Your system supports dual-channel memory architecture. Refer to “Memory
Configuration” on page 28 for details.
Memory Sparing and Mirroring
The chipset includes hardware that supports memory mirroring and memory on-line
sparing. Both memory mirroring and memory on-line sparing provide a way to prevent
data loss in case a DIMM fails.
With memory mirroring the system maintains two copies of all data in the memory
subsystem. If a DIMM fails, the data is not lost because the second copy of the data is
available from the mirrored DIMM in the opposite channel. The system will not fail
due to memory error unless both the primary and the mirrored copy of the data become
corrupt at the same time.
In a mirrored system, the maximum usable memory is one-half of the installed
memory, with a minimum of four DIMMs installed. Since the data is duplicated across
DIMMs, it means that up to one-half of the installed DIMMs are actively in use at any
one time. The remaining DIMMs are used for mirroring.
Memory mirroring and memory sparing are mutually exclusive. Only one can be active
at a time.
Expansion Slots
■
One 32-bit/33MHz, 5V PCI connector.
■
One full-length 64-bit/100MHz PCI-X connector.
■
One full-length 64-bit/133MHz PCI-X connector.
■
Two x4 PCI Express connectors.
Video
The motherboard features the ATI RN50 video controller with 16 MB external video
memory.