64 HP ProLiant DL580 Generation 3 Server Maintenance and Service Guide
Single- and dual-rank DIMMs
PC2-3200 DIMMs can either be single- or dual-rank. While it is not normally
important for you to differentiate between these two types of DIMMs, certain
DIMM configuration requirements are based on these classifications.
Certain configuration requirements exist with single- and dual-rank DIMMs that
allow the architecture to optimize performance. A dual-rank DIMM is similar to
having two separate DIMMs on the same module. Although only a single DIMM
module, a dual-rank DIMM acts as if it were two separate DIMMs. The primary
reason for the existence of dual-rank DIMMs is to provide the largest capacity
DIMM given the current DIMM technology. If the maximum DIMM technology
allows for creating 2-GB single-rank DIMMs, a dual-rank DIMM using the same
technology would be 4-GB.
Advanced ECC memory
Advanced ECC is the default memory protection mode for this server. In
Advanced ECC, the server is protected against correctable memory errors. The
server will provide notification if the level of correctable errors exceeds a
predefined threshold rate. The server does not fail because of correctable
memory errors.
Advanced ECC provides additional protection over Standard ECC in that 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 DIMM.
The following guidelines apply to Advanced ECC memory:
• All general memory requirements apply ("General memory configuration
requirements" on page 62
).
• Advanced ECC mode is supported with one to four memory boards.
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