HP ProLiant DL380 G4 Server - Manual (Page 42)

Hardware options installation 42
The server only supports Advanced ECC with dual-rank DIMMs installed. Online Spare is not supported
by dual-rank DIMMs. Early DL380G4 ROMs do not support dual-rank DIMMs. Be sure you upgrade your
ROM before installing dual-rank DIMMs.
• Standard memory configuration for maximum performance with up to 8 GB of active memory (four
2-GB dual-rank memory DIMMs)
For more information on single-rank and dual-rank DIMM configurations, see "DIMM Configuration
Requirements (on page
42 )."
DIMM configuration requirements
The following configuration requirements apply to single-rank and dual-rank DIMMs:
• Install only PC2-3200 Registered DDR-2 SDRAM DIMMs, 1.8 volts, 72 bits wide, and ECC.
• DIMMs must be installed in pairs.
• DIMM pairs in a memory bank must have the same HP part numbers.
• Always populate the DIMMs in sequential order per bank: Bank A, Bank B, and then Bank C.
• Dual-rank DIMMs must be populated before single-rank DIMMs (see table below).
• If dual-rank DIMMs are installed in Bank A and Bank B, no additional DIMMs may be installed in
Bank C (see table below).
• The following table lists all seven (7) valid combinations of single-rank and dual-rank DIMM
configurations. "Single" indicates a bank of single-rank DIMMs. "Dual" indicates a bank of dual-rank
DIMMs. An invalid configuration will result in all DIMM failure LEDs lit and the system will hang. If
dual-rank DIMMs are installed, online spare memory is not supported. Note that a bank contains 2
DIMMs.
Configuration Bank A Bank B Bank C Notes
1 Single Single
2 Single
3 Single Single Single
4 Dual Online Spare not supported
5 Dual Single Online Spare not supported
6 Dual Single Single Online Spare not supported
7 Dual Dual Online Spare not supported
• The memory configurations, including Advanced ECC or Online Spare, can be configured in RBSU.
RBSU displays a warning message if the selected AMP mode is not supported by the current
configuration. However, if the DIMM configuration at POST does not meet the requirements for the
AMP mode selected in RBSU, the server defaults to Advanced ECC. The system indicates this by
displaying a message during POST.
• If your server contains more than 4 GB of memory, consult your operating system documentation
about accessing the full amount of installed memory.
Online spare memory configuration
In the online spare configuration, the ROM automatically configures the last populated bank as the spare
memory. If only banks A and B are populated, bank B is the spare bank. If banks A, B, and C are
populated, bank C is the spare bank. If DIMMs in a non-spare bank exceed the limit for the single-bit