Hardware options installation 37
Single-rank and dual-rank DIMMs
DIMM configuration requirements are based on these classifications:
• Single-rank DIMM—One set of memory chips that is accessed while writing to or reading from the
memory.
• Dual-rank DIMM—Two single-rank DIMMs on the same module, with only one rank 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-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.
Memory subsystem architecture
The memory subsystem in this server is divided into channels. Each channel supports two DIMM slots.
Channel Slot Slot number
A
C
A
1
2
B
D
B
3
4
This server supports UDIMMs.
DIMM slots in this server are identified by number and by letter. Letters identify the population order. Slot
numbers are reported by ROM messages during boot and for error reporting. For the DIMM slot locations,
see "DIMM slot locations."
Memory configuration
To optimize server availability, the server supports Advanced ECC. This feature provides the greatest
memory capacity for a given DIMM size, while providing up to 8-bit error correction, depending on the
specific DIMM type. This mode is the default option for this server.
Advanced Memory Protection options are configured in RBSU. If the requested AMP mode is not supported
by the installed DIMM configuration, the server boots in Advanced ECC mode. For more information, see
"HP ROM-Based Setup Utility (on page 47)."
For the latest memory configuration information, see the product QuickSpecs on the HP Product Bulletin
website (http://www.hp.com/go/productbulletin).
ECC memory configuration
ECC memory is the default memory protection mode for this server. Standard ECC can correct single-bit
memory errors and detect multi-bit memory errors. When multi-bit errors are detected by using Standard
ECC, the error is sent to the server and causes the server to halt.
UDIMM maximum memory configurations
The server supports a maximum of 32 GB, using 2 GB, 4 GB, and 8 GB single- or dual-rank UDIMMs.
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