Acer Altos R510, User Manual

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4 Configuring the system
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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: 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)