Acer AR180 F1 - Manual (Page 61)

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Upgrading the system memory
System memory interface
Each processor has three memory channels (1, 2 and 3 ) and each
channel has two slots - A (PxDIMM1A, 2A, 3A in blue) and B
(PxDIMM1B, 2B, 3B in black). So, the system has a total of twelve
memory slots. The memory slots support DDR3-1333 registered/
unbuffered ECC memory modules.
The folllowing illustration shows the processor 1 memory slots (1) and
processor 2 memory slots (2).
Independent mode
• For all memory modes, slot A in each channel should be populated
first and then slot B. If slot A is empty, then slot B cannot be used.
• For a single-processor server configuration, install the processor to
CPU1 socket and the memory modules in slots P1DIMM 1A to
P1DIMM 3B.
• If there is a processor installed in CPU2 socket, the system will
enable the slots P2DIMM 1A to P2DIMM 3B.
• It is recommended to install the DIMM modules in the following
sequence:
For single processor
• Populate slot 1A first, followed by slots 2A, 3A,1B, 2B and 3B.
• The memory slots for processor 2 are not available.