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Hardware options installation 30
• Each channel supports up to two Unbuffered DIMMs.
• If quad-rank DIMMs are installed for a processor, a maximum of two DIMMs can be installed on
each channel for that processor.
• If a channel contains quad-rank DIMMs, the quad-rank DIMM must be installed first on that channel.
DIMM speeds are supported as indicated in the following table.
Populated slots
(per channel)
Rank
Speeds supported
(MHz)
1 Single- or dual-rank 1333, 1066
1 Quad-rank 1066
2 Single- or dual-rank 1066
3 Single- or dual-rank 800
Advanced ECC population guidelines
For Advanced ECC mode configurations, observe the following guidelines:
• Observe the general DIMM slot population guidelines (on page 29).
• DIMMs may be installed individually.
Single-processor Advanced ECC population order
For Advanced ECC mode configurations with a single processor, populate the DIMM slots in the following
order:
• RDIMM: Sequentially in alphabetical order (A through I)
• UDIMM: A through F, sequentially in alphabetical order. Do not populate DIMM slots G through I.
Lockstep Memory population guidelines
For Lockstep memory mode configurations, observe the following guidelines:
• Observe the general DIMM slot population guidelines (on page 29).
• Always install DIMMs in channels 1 and 2 for each installed processor.
• Do not install DIMMs in channel 3 for any processor.
• DIMM configuration on channel 1 and channel 2 of a processor must be identical.
• In multi-processor configurations, each processor must have a valid Lockstep Memory configuration.
• In multi-processor configurations, each processor may have a different valid Lockstep Memory
configuration.
Single-processor Lockstep population order
For Lockstep memory mode configurations with a single processor, populate the DIMM slots in the
following order:
• RDIMM
o First: A and B
o Next: D and E