Owners Manual

channel 3: memory sockets B4, B8, and B12

Processor 3 channel 0: memory sockets C1, C5, and C9

channel 1: memory sockets C2, C6, and C10

channel 2: memory sockets C3, C7, and C11

channel 3: memory sockets C4, C8, and C12

Processor 4 channel 0: memory sockets D1, D5, and D9

channel 1: memory sockets D2, D6, and D10

channel 2: memory sockets D3, D7, and D11

channel 3: memory sockets D4, D8, and D12

The following table shows the memory populations and operating frequencies for the supported

configurations.

Table 20. Supported configurations

DIMM type DIMMs

populated/

channel

Voltage Operating frequency

(in MT/s)

Maximum DIMM rank/

channel

RDIMM 1

1.2 V

2400, 2133, and 1866 single and dual rank

2 2400, 2133, and 1866 single and dual rank

3 1866 single and dual rank

LRDIMM 1

1.2 V

2400, 2133, and 1866 quad rank

2 2400, 2133, and 1866 quad rank

3 2133 quad rank

General memory module installation guidelines

Your system supports Flexible Memory Configuration, enabling the system to be configured and run in

any valid chipset architectural configuration. The following are the recommended guidelines for best

performance:

• LRDIMMs, and RDIMMs must not be mixed.

• x4 and x8 DRAM based DIMMs can be mixed. For more information, see the Mode-specific guidelines

section.

• A maximum of three single- or dual-rank RDIMMs can be populated in a channel.

• Up to three LRDIMMs can be populated regardless of rank count.

• Populate four DIMMs per processor (one DIMM per channel) at a time to maximize performance.

• If memory modules with different speeds are installed, they operate at the speed of the slowest

installed memory module(s) or slower depending on system DIMM configuration.

• Populate DIMMs based on the following processor-heat sink configurations.

• Populate DIMM sockets only if a processor is installed. For single-processor systems, sockets A1 to

A12 are available. For dual-processor systems, sockets A1 to A12 and sockets B1 to B12 are available.

• Populate all sockets with white release tabs first, black, and then green.