Compaq ProLiant DL980 - G7 Server User's Guide download pdf (Page 42)

Hardware options installation 42

Item Description Definition

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 128 DIMMs per system. When installing DIMMs in the

memory cartridge, 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.

• DIMMs must be installed in quads with identical characteristics. When possible, for configuration

simplicity, HP recommends using DIMMs with identical part numbers throughout the system.

• DIMM quads must be populated in sequence by letter designation. Install DIMM quad (1A, 8A in

both cartridges) first, followed by DIMM quad (3B, 6B in both cartridges), DIMM quad (2C, 7C in

both cartridges) and DIMM quad (4D, 5D in both cartridges).

• To achieve maximum performance, balance DIMM quads by letter groupings across all memory

cartridges so that the (1A, 8A) pair is installed in all memory cartridges first, followed by the B-pair,

C-pair, and D-pair.

• When installing mixed rank DIMMs in any cartridge, DIMMs with the highest number of ranks must

be installed in the white DIMM connector locations. This guarantees proper electrical signaling on

the DDR3 channel since DIMMs with higher rank counts present larger electrical loading on the

DDR3 channel and must be populated at the end point of the channel. For more information, see the

illustration below.

CAUTION: Failure to follow these guidelines may result in the inability to recognize memory,

memory errors, or reduced memory performance.

• AMP modes Advanced ECC, Online Spare, and Mirrored Memory have further requirements

beyond the ones listed here. For additional memory configuration requirements, see the

corresponding AMP sections:

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Compaq ProLiant DL980 - G7 Server User's Guide Page 42