Acer Altos G520 - Manual (Page 69)

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Upgrading the system memory
This section includes instructions for removing and installing a
memory module.
The Server Boards Altos G520 each provides four DDR266 / DDR333
DIMM sites in two DIMM banks. The maximum memory capacity is 8GB
for either DDR266 or DDR333 memory. Memory DIMM technologies
supported are: 128MB, 256MB, 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 DIMMS in Bank 1 (DIMM1B and DIMM1A) must be populated
before any DIMMs are installed in Bank 2 (DIMM2B and DIMM2A).
Bank 2 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: Dual-channel memory requires symmetrical memory
modules using the same density (e.g. 256MB,512MB), bus width
(e.g. x8 ,x16) and granule technology (e.g. 256M-bit, 512M-bit)
The mixing of DDR266 and DDR333 memory is supported on the Server
Boards Altos G520. However, when mixing DIMM types, DDR333 will
be treated as DDR266.
Warning! Functionality issues may be encountered if mixed
memory types are installed on the same server board. DIMM
modules of identical type, banking and stacking technology, and
vendor should be installed in the Altos G520.
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