Hardware options installation 42
Although only one data rank is accessed at any given time for each DIMM, optimized command and
address pipelining via various interleaving schemes enables the Intel® Xeon™ 7500-series processor
architecture to benefit from dual-rank and quad-rank DIMMs. A dual-rank DIMM performs significantly
better than its single-rank counterpart. A quad-rank DIMM provides further performance improvement even
at the same DIMM capacity.
DIMM identification
To determine DIMM characteristics, use the label attached to the DIMM and the following illustration and
table.
Item Description Definition
1 Size —
2 Rank
1R = Single-rank
2R = Dual-rank
4R = Quad-rank
3 Data width
x4 = 4-bit
x8 = 8-bit
4 Memory speed
10600 = 1333-MHz
8500 = 1066-MHz
5 DIMM type R = RDIMM (registered)
For the latest supported memory information, see the QuickSpecs on the HP website
(http://www.hp.com
).
DIMM installation guidelines
This server supports two memory cartridges per processor. Each memory cartridge can support up to eight
DIMMs. Eight memory cartridges provide a total of 64 DIMMs per system. When installing DIMMs in the
memory cartridge ("Memory options" on page 41), observe the following minimum guidelines:
• The minimum configuration is two DIMMs per cartridge. Running in Lockstep mode, such DIMM pairs
offer larger memory protection to provide increased memory fault resiliency.
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