User guide

Hardware options installation 31

General DIMM slot population guidelines

Observe the following guidelines for all AMP modes:

• Populate DIMM slots for a processor only if the processor is installed.

• To maximize performance in multi-processor configurations, distribute the total memory capacity

between all processors as evenly as possible.

• Do not mix Unbuffered and Registered PC3 DIMMs.

• 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)

Single- or dual-rank 1333, 1066

Quad-rank 1066

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 (on page 31).

• 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 F)

• UDIMM: Sequentially in alphabetical order (A through F).

Multi-processor Advanced ECC population order

For Advanced ECC mode configurations with multiple processors, populate the DIMM slots for each

processor in the following order:

• RDIMM: Sequentially in alphabetical order (A through F)

• UDIMM: Sequentially in alphabetical order (A through F).

Mirrored Memory population guidelines

For Mirrored Memory mode configurations, observe the following guidelines:

• Observe the general DIMM slot population guidelines (on page 31).

• Always install DIMMs in channels 1 and 2 for each installed processor.