Hp ProLiant ML370 G6 Server User Manual download pdf (Page 47)

Hardware options installation 47

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.

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 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 ML370 G6 Server User Manual Page 47