Hardware options installation 44
General DIMM slot population guidelines
Observe the following guidelines for all AMP modes:
• Install DIMMs only if the corresponding processor is installed.
• When multiple processors are installed, HP recommends balancing the DIMMs across the all
processors.
• White DIMM slots denote the first slot of a channel (Ch 1-A, Ch 2-B, Ch 3-C, Ch 4-D...).
• Do not mix LRDIMMs and RDIMMs.
• UDIMMs are not supported on this server.
• When multiple processors are installed, HP recommends installing the DIMMs in sequential
alphabetical order: P1-A, P2-A... P4-A, P1-B, P2-B... P4-B, P1-C, P2-C... P4-C, and so on.
For detailed memory configuration rules and guidelines, use the Online DDR3 Memory Configuration Tool
on the HP website (http://www.hp.com/go/ddr3memory-configurator).
DIMM speeds are supported as indicated in the following table.
Populated slots
(per channel)
Rank Speeds supported (MT/s)
1
Single- or dual-rank 1333, 1600
1
Quad-rank 1333
2
Single- or dual-rank 1333
3
Advanced ECC population guidelines
For Advanced ECC mode configurations, observe the following guidelines:
• Observe the general DIMM slot population guidelines (on page 44).
• DIMMs may be installed individually.
Online spare population
For Online Spare memory mode configurations, observe the following guidelines:
• Observe the general DIMM slot population guidelines (on page 44).
• Each channel must have a valid online spare configuration.
• Each channel can have a different valid online spare configuration.
• Each populated channel must have a spare rank:
o A single dual-rank DIMM is not a valid configuration.
o LRDIMMs are treated as dual-rank DIMMs.
Lockstep Memory population guidelines
For Lockstep memory mode configurations, observe the following guidelines:
• Observe the general DIMM slot population guidelines (on page 44).
