Compaq ProLiant DL388e Guide de l'utilisateur télécharger pdf (Page 46)

Hardware options installation 46

Memory options

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

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

The memory subsystem in this server 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 must be the same type.

The server 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 49)."

Memory subsystem architecture

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

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

Channel Population order Slot number

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

also enables the Lockstep, Online Spare, and Mirrored Memory modes. This server 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 memory control subsystem selects the proper rank within the

DIMM when writing to or reading from the DIMM.

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Compaq ProLiant DL388e Guide de l'utilisateur Page 46