HP ProLiant BL685c Server-Blade - Manual (Page 32)

Hardware options installation 32
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
• Install DIMMs in pairs (banks) beginning with banks farthest from each populated processor.
• Install DIMMs with the greatest capacity in the banks farthest from the processor.
• Install identical DIMMs with the same part number in a bank.
• DIMMs must be installed for processor 1.
• DIMMs installed in different banks can be of different sizes.
• For best performance, populate one bank of memory for each installed processor before populating
more than one bank for a specific processor.
• DIMMs installed in banks for processor 3 and 4 can be used only if processor 3 and 4 are installed.
• Processors 3 and 4 can be installed without memory.
CAUTION: Always wear an antistatic wrist strap when working inside the server.
DIMM population order
Bank A
1A, 2A
Bank B
3B, 4B
Bank C
5C, 6C
Bank D
7D, 8D
Bank E
9E, 10E
Bank F
11F, 12F
Bank G
13G,14G
Bank H
15H, 16H
Dual processor 1st 3rd 2nd 4th — — — —
Quad processor 1st 5th 2nd 6th 3rd 7th 4th 8th
Installing DIMMs
To install the component:
1. Power down the server blade (on page 13 ).
2. Remove the server blade (on page 14 ).
3. Remove the access panel (on page 14 ).
4. Remove the DIMM baffle (on page 15 ).
5. Open the DIMM slot latches.