Acer AT350 F1 - Manual (Page 65)

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Upgrading the system memory
System memory interface
The server has a total of eighteen DIMM slots. Each CPU controls three
channels and each channel has three slots. The DIMM slots support
DDR3-1333 registered/unbuffered ECC memory modules.
For single rank and dual rank RDIMM, a maximum of three DIMMs per
channel or a total of 18 DIMMs can be supported. For UDIMM and
quad rank RDIMM, the server only supports two DIMMs per channel or
a maximum of 12 DIMMs.
In each channel, the slot farthest from the CPU is slot A (1A, 2A and 3A
in blue) while the nearest one is slot C (1C, 2C and 3C in black).
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 slots B and C cannot be
used.
• For a single-processor server configuration, install the processor in
CPU1 socket and the memory modules in slots P1DIMM 1A to
P1DIMM 3C.
• If there is a processor installed in CPU2 socket, the system will
enable the slots P2DIMM 1A to P2DIMM 3C.