HP Integrity rx8640 User Manual

The memory subsystem comprises four independent quadrants. Each quadrant has its own
memory data bus connected from the cell controller to the two buffers for the memory quadrant.
Each quadrant also has two memory control buses: one for each buffer.
Figure 1-8 Memory Subsystem
P D H R i se r
B o a r d
D I MM
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C o n t r o l l e r
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F r on t S i d e B u s 0
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D I MM
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A d d r e ss /
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C o n t r o l l e r
A d d r e ss /
C o n t r o l l e r
B u f f e r
DIMMs
The memory DIMMs used by the server are custom designed by HP. Each DIMM contains DDR-II
SDRAM memory that operates at 533 MT/s. Industry standard modules do not support the high
availability and shared memory features of the server. Therefore, industry standard DIMM
modules are not supported.
The server supports DIMMs with densities of 1, 2, 4, and 8 GB. Table 1-2 lists each supported
DIMM size, the resulting total server capacity, and the memory component density. Each DIMM
is connected to two buffer chips on the cell board.
Table 1-2 DIMM Sizes Supported
Memory Component DensityTotal CapacityDIMM Size
256 Mb64 GB1 GB
512 Mb128 GB2 GB
1024 Mb256 GB4 GB
2048 Mb512 GB8 GB
20 HP Integrity rx8640 and HP 9000 rp8440 Server Overview

HP Integrity rx8640 Specifications

General

Brand	HP
Model	Integrity rx8640
Category	Server
Language	English