Acer Altos G520 series, Руководство по обслуживанию

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16 Chapter 1
Memory Combinations
NOTE: Altos G520 provides four DDR333 DIMM slots in dual memory channels. DIMM 1A and DIMM 2A
are connected to memory channel A. DIMM1B and DIMM2B are connected to memory channel B. The
maximum memory capacity is 8GB DDR333 memory. Memory DIMM technologies supported are:
256MB, 512MB, 1GB, and 2GB.
NOTE: 2-way memory interleave requires symmetrical memory modules using the same density (e.g. 256MB,
512MB), bus width (e.g.x8, x16) and granule technology (e.g. 256Mb, 512Mb).
TO provide a memory fault tolerant system, Altos G520 includes specialized hardware to support fail-over
to a spare DIMM device (DIMM 2B and DIMM 2A) 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 correpsonding partner in the other channel (if
applicable), will over time have its data copied over to the spare DIMM(s) held in reserve. When all the data
has been copied, the reserve DIMM(s) will be put into service and the falling DIMM will be removed from
service. Only one sparing cycle is supported. If this feature is not enabled, then all DIMMs will be visible
in normal address speace.
DIMM1B DIMM1A DIMM2B DIMM2A Memory Interleave
256MB 1-way
512MB 1-way
1GB 1-way
2GB 1-way
256MB 256MB 2-way
512MB 512MB 2-way
1GB 1GB 2-way
2GB 2GB 2-way
256MB 256MB 256MB 256MB 2-way
512MB 512MB 512MB 512MB 2-way
1GB 1GB 1GB 1GB 2-way
2GB 2GB 2GB 2GB 2-way
Memory Sparing
DIMM 1B DIMM 1A DIMM 2B (Spare) DIMM 2A (Spare)
Total Memory
Physical Memory Detected by OS
256MB 256MB 256MB 256MB 1GB 512MB
512MB 512MB 512MB 512MB 2GB 1GB
1GB 1GB 1GB 1GB 4GB 2GB
2GB 2GB 2GB 2GB 8GB 4GB