Acer AT350 F2 Series Service Manual page 76

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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
Density
Rank
Bit
Organization
Speed
Density
Rank
Bit organization
Speed
Description
1 GB, 2 GB, 4 GB, 8 GB.
Intel E5-2600 series processor supports DIMM organized by
1Gb, 2Gb or 4Gb DRAM chips.
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.
This platform supports x4 and x8.
Note: It is not recommended to mix DIMMs with different
ranks in one system.
PC3 - 6400 => DDR3- 800
PC3 - 8500 => DDR3- 1066
PC3 - 10600 => DDR3- 1333
PC3 - 12800 => DDR3- 1600
3 System upgrades