Acer AT350 F1 - Manual (Page 73)

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Memory identification
Generally, there are some memory information printed on the label of
the DIMM module. Different vendors may have different formats but
the convention is usually like this:
Item Description
Density 1 GB, 2 GB, 4 GB, 8 GB.
• Intel Xeon 5500 series processor supports DIMM
organized by 1Gb or 2Gb DRAM chips.
• Intel Xeon 5600 series processor supports DIMM
organized by 1Gb, 2Gb or 4Gb DRAM chips.
Rank 1R = Single Rank
2R = Dual Rank
4R = Quad Rank
Note: If quad rank DIMM is used, a maximum of only two
DIMMs per channel can be supported.
Bit
Organization This platform supports x4 and x8.
Note: It is not recommended to mix DIMMs with different
ranks in one system.
Speed PC3 - 6400 => DDR3- 800
PC3 - 8500 => DDR3- 1066
PC3 - 10600 => DDR3- 1333
PC3 - 12800 => DDR3- 1600
Density
Rank
Bit organization
Speed