Acer AB460 F1 - Manual (Page 179)

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Mirroring or Lockstep Mode: Single processor configuration
Please follow the table as shown below. The same rules are applied to
the CPU2 memory channel.
For mirroring mode, there is a primary and a copy of the primary
image. By this definition, the effective size of memory is reduced by at
least one-half
Total
Capacity
DIMM 1B DIMM 1A DIMM 2B DIMM 2A
2GB 1GB 1GB
4GB 1GB 1GB 1GB 1GB
4GB 2GB 2GB
8GB 2GB 2GB 2GB 2GB
8GB 4GB 4GB
16GB 4GB 4GB 4GB 4GB
16GB 8GB 8GB
32GB 8GB 8GB 8GB 8GB
32GB 16GB 16GB
64GB 16GB 16GB 16GB 16GB