HP DL580 - Manual (Page 40)

Hardware options installation 40
• FBDIMMs must be ECC Registered DDR-2 SDRAM FBDIMMs.
• FBDIMMs must be installed in sequential order, beginning with bank A.
• FBDIMMs must be installed in pairs.
• FBDIMM pairs in a memory bank must have identical HP part numbers.
• FBDIMMs must be populated as specified for each AMP memory mode.
The memory subsystem for this server is divided into two branches. Each memory branch is essentially a
separate memory controller. The FBDIMMs map to the two branches as indicated in the following table:
Branch 0 Branch 1
FBDIMM 1A FBDIMM 9B
FBDIMM 5A FBDIMM 13B
FBDIMM 2C FBDIMM 10D
FBDIMM 6C FBDIMM 14D
FBDIMM 3E FBDIMM 11F
FBDIMM 7E FBDIMM 15F
FBDIMM 4G FBDIMM 12H
FBDIMM 8G FBDIMM 16H
Memory board 1 (optional) Memory board 3 (optional)
Memory board 2 (optional) Memory board 4 (optional)
This multi branch architecture provides enhanced performance in Advanced ECC mode. The concept of
multiple branches is important for the operation of online spare mode and mirrored memory mode.
If the server contains more than 4 GB of memory, consult the operating system documentation about
accessing the full amount of installed memory.
Advanced ECC memory
Advanced ECC memory is the default memory protection mode for this server. In Advanced ECC, the
server is protected against correctable memory errors. The server provides notification if the level of
correctable errors exceeds a pre-defined threshold rate. The server 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 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
FBDIMM.
Advanced ECC memory supports the following FBDIMM configurations:
Configuration Bank A
1A/5A
Bank B
9B/13B Bank C
2C/6C Bank D
10D/14D Bank E
3E/7E Bank F
11F/15F Bank G
4G/8G Bank H
12H/16H
1 X
2 X X
3 X X X
4 X X X X