Advanced Ecc Memory; Dimm Installation Guidelines; Dimm Population Order; Installing Dimms - HP BL685c - ProLiant - 4 GB RAM User Manual

For DIMM slot locations and bank assignments, see "DIMM slots (on page 11)."

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
o
Bus width: 72 bits
o
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:

DIMM population order

Dual processor
Quad processor

Installing DIMMs

To install the component:
Power down the server blade (on page 14).
1.
Always wear an antistatic wrist strap when working inside the server.
Bank A Bank B Bank C
1A, 2A 3B, 4B 5C, 6C
1st 3rd 2nd
1st 5th 2nd
Bank D Bank E Bank F
7D, 8D 9E, 10E 11F, 12F
4th — —
6th 3rd 7th
Bank G Bank H
13G,14G 15H, 16H
— —
4th 8th
Hardware options installation 34