Hp ProLiant BL280c G6 Server-Blade User Manual download pdf (Page 28)

Hardware options installation 28

The memory subsystem in this server blade can support RDIMMs or UDIMMs. Both types are referred to as

DIMMs when the information applies to both types. When specified as RDIMM or UDIMM, the information

applies to that type only. All memory installed in the server blade must be the same type.

The server blade supports the following DIMM speeds:

• Single- and dual-rank PC3-10600 (DDR-1333) DIMMs operating at 1333 and 1066 MHz

• Quad-rank PC3-8500 (DDR-1067) DIMMs operating at 1066 MHz

Depending on the processor model, the number of DIMMs installed, and whether UDIMMs or RDIMMs are

installed, the memory clock speed may be reduced to 1066 or 800 MHz. For more information on the effect

of DIMM slot population, see "General DIMM slot population guidelines (on page 31)."

Memory subsystem architecture

The memory subsystem in this server blade is divided into channels. Each processor supports three channels,

and each channel supports two DIMM slots, as shown in the following table.

Channel Slot Slot number

This multi-channel architecture provides enhanced performance in Advanced ECC mode. This architecture

also enables the Mirrored Memory and Lockstep memory modes. This server blade supports both Registered

PC3 DIMMs (RDIMMs) and Unbuffered DIMMs (UDIMMs).

DIMM slots in this server are identified by number and by letter. Letters identify the slots to populate for

specific AMP modes. Slot numbers are reported by ROM messages during boot and for error reporting.

Single-, dual-, and quad-rank DIMMs

To understand and configure memory protection modes properly, an understanding of single-, dual-, and

quad-rank DIMMs is helpful. Some DIMM configuration requirements are based on these classifications.

A single-rank DIMM has one set of memory chips that is accessed while writing to or reading from the

memory. A dual-rank DIMM is similar to having two single-rank DIMMs on the same module, with only one

rank accessible at a time. A quad-rank DIMM is, effectively, two dual-rank DIMMs on the same module. Only

one rank is accessible at a time. The server blade memory control subsystem selects the proper rank within

the DIMM when writing to or reading from the DIMM.

Dual- and quad-rank DIMMs provide the greatest capacity with the existing memory technology. For

example, if current DRAM technology supports 2-GB single-rank DIMMs, a dual-rank DIMM would be 4-GB,

and a quad-rank DIMM would be 8-GB.

DIMM identification

IMPORTANT: This server blade does not support mixing RDIMMs and UDIMMs. Attempting to

mix these two types causes the server to halt during BIOS initialization.

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Hp ProLiant BL280c G6 Server-Blade User Manual Page 28