HP ProLiant DL980 DL980 G7 Maintenance & Service Guide - Page 43

DIMM installation guidelines, Memory cartridge population guidelines, AMP modes Advanced ECC

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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 ("Installing memory" on page 36), 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: o Advanced ECC memory population guidelines (on page 47) o Online Spare memory population guidelines (on page 47) o Mirrored Memory population guidelines (on page 48) Memory cartridge population guidelines This server contains eight memory cartridge slots in each processor memory drawer. Illustrated parts catalog 43

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Illustrated parts catalog 43
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 ("
Installing memory
" on page
36
), 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:
o
Advanced ECC memory population guidelines (on page
47
)
o
Online Spare memory population guidelines (on page
47
)
o
Mirrored Memory population guidelines (on page
48
)
Memory cartridge population guidelines
This server contains eight memory cartridge slots in each processor memory drawer.