Acer Altos R510, Service Manual

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93 Chapter 3
Memory Installations and Upgrade
Upgrading the system memory
This section includes instructions for removing and installing a memory module.
The Altos R510 provides six DDR333 DIMM sites in two DIMM channels. DIMMs 1A, 2A and 3A are
connected to memory channel A. DIMM 1B, 2B and 3B are connected to memory channel B.
The maximum memory capacity is 12GB DDR333 memory.
Memory DIMM technologies supported are: 512MB, 1 GB and 2 GB.
The minimum memory configuration is one DIMM, installed in DIMM socket 1B (the socket farthest from the
processors). However, for optimum performance and dual-channel interleave operation, a minimum of two
DIMMs should be installed. DIMMs on channel A are paired with DIMMs on channel B to configure 2-way
interleaving.
Both DIMM1B and DIMM1A must be populated before any DIMMs are installed. DIMM2B and DIMM2A must
be populated in pairs. DIMM3B and DIMM3A must be populated in pairs.
Both DIMMs in a bank must be identical (same manufacturer, CAS latency, number of rows, columns and
devices, timing parameters etc.). Although DIMMs within a bank must be identical, the BIOS supports various
DIMM sizes and configurations allowing the banks of memory to be different.
NOTE: Note: Dual-channel memory requires symmetrical memory modules using the same density (e.g.
512MB), bus width (e.g. x8 ,x16) and granule technology (e.g. 256M-bit, 512M-bit)
Memory Sparing
To provide a more fault tolerant system, the Altos R510 includes specialized hardware to support fail-over to a
spare DIMM device in the event that a primary DIMM in use exceeds a specified threshold of runtime errors.
One of the DIMMs installed per channel will not be used, but kept in reserve. In the event of significant failures
in a particular DIMM, it and its corresponding partner in the other channel (if applicable), will, over time, have
DIMM
1B DIMM
1A DIMM
2B DIMM
2A DIMM
3A DIMM
3B
Mem-
ory
Inter-
leave
512MB 1-way
1GB 1-way
2GB 1-way
512MB 512MB 2-way
1GB 1GB 2-way
2GB 2GB 2-way
512MB 512MB 512MB 512MB 2-way
1GB 1GB 1GB 1GB 2-way
2GB 2GB 2GB 2GB 2-way
512MB 512MB 512MB 512MB 512MB 512MB 2-way
1GB 1GB 1GB 1GB 1GB 1GB 2-way
2GB 2GB 2GB 2GB 2GB 2GB 2-way