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Hardware options installation 26
NOTE: The Advanced Memory Protection option in RBSU provides additional memory protection beyond
Advanced ECC. By default, the server is set to Advanced ECC Support. For more information, refer to
"HP ROM-Based Setup Utility (on page 41)."
For DIMM slot locations and bank assignments, see "DIMM slots (on page 10)."
Advanced ECC memory
Advanced ECC memory is the default memory protection mode for this server blade. In Advanced ECC,
the server blade is protected against correctable memory errors. The server blade provides notification if
the level of correctable errors exceeds a pre-defined threshold rate. The server blade does not fail
because of correctable memory errors. Advanced ECC provides additional protection over Standard ECC
because it is possible to correct certain memory errors that would otherwise be uncorrectable and result in
a server blade failure.
Whereas standard ECC can correct single-bit memory errors, Advanced ECC can correct single-bit
memory errors and multi-bit memory errors if all failed bits are on the same DRAM device on the DIMM.
DIMM installation guidelines
Observe the following guidelines when installing additional memory:
• Install only ECC PC2-5300 Registered DDR2 SDRAM DIMMs that meet the following specifications:
• Supply voltage: 1.8 V
• Bus width: 72 bits
• Observe the following special conditions when installing memory with a second processor:
• Processor 2 can be installed without memory.
• Any memory installed into banks for processor 2 can be used only if processor 2 is installed.
• DIMMs must always be installed in pairs.
• HP recommends installing DIMMs with the greatest capacity in the banks farthest from each
populated processor first.
• DIMMs installed in the same memory bank must have the same part number.
• DIMMs installed in different banks can be of different sizes.
CAUTION: Always wear an antistatic wrist strap when working inside the server.
The server blade supports multiple memory modes, based on DIMM population. Use RBSU ("HP ROM-
Based Setup Utility" on page 41) to select a mode (System will default to Advanced ECC).
DIMM population order
Configuration Bank A
1A and 2A
Bank B
3B and 4B
Bank C
5C and 6C
Bank D
7D and 8D
Single processor 1st 2nd — —
Dual processor 1st 3rd 2nd 4th
Installing DIMMs
1. Power down the server blade (on page 12).
2. Remove the server blade (on page 13).
3. Remove the access panel (on page 13).