Acer AR380 F1 - Manual (Page 74)

3 System upgrades 56
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:
Installing a memory module:
Warning! Memory of the identical size, speed, and organization
must be installed in the same colored DIMM slots.
1 Observe the pre-installation instructions on page 26.
Item Description
Density 1GB, 2GB,4GB,8GB.
Intel Xeon Processor 5500 Series CPU supports DIMM
organized by 1Gb or 2Gb 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 recommend to mix DIMMs with different bit
organizations in one system.
Speed PC3 - 6400 => DDR3- 800
PC3 - 8500 => DDR3- 1066
PC3 - 10600 => DDR3- 1333
PC3 - 12800 => DDR3- 1600