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Hardware options installation 53
contents of the degraded rank to the online spare rank. The server then deactivates the failing rank and
automatically switches over to the online spare rank.
Lockstep memory configuration
Lockstep mode provides protection against multi-bit memory errors that occur on the same DRAM device.
Lockstep mode can correct any single DRAM device failure on x4 and x8 DIMM types. The DIMMs in each
channel must have identical HP part numbers.
General DIMM slot population guidelines
Observe the following guidelines for all AMP modes:
• Install DIMMs only if the corresponding processor is installed.
• When two processors are installed, balance the DIMMs across the two 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, UDIMMs, RDIMMs, or HDIMMs.
• Do not install more than two UDIMMs per channel. UDIMMs should not be installed in slots Ch 1-I, Ch
2-J, Ch 3-K, or Ch 4-L.
• HDIMMs require 12 DIMMs per processor.
• When two processors are installed, install the DIMMs in sequential alphabetical order balanced
between the two processors: P1-A, P2-A, P1-B, P2-B, P1-C, P2-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
Single- or dual-rank 1066
Advanced ECC population guidelines
For Advanced ECC mode configurations, observe the following guidelines:
• Observe the general DIMM slot population guidelines.
• 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.
• Each channel must have a valid online spare configuration.