DFI EL331-RM - Manual (Page 16)

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Hardware Installation
DIMMs are on the same channel.
DIMMs in a channel can be identical or com-
pletely different. However, we highly recommend
using identical DIMMs.
Not all slots need to be populated.
DIMMs of the same memory configuration are
on different channels.
Single Channel
Dual Channel
The system board supports the following memory interface.
Single Channel (SC)
Data will be accessed in chunks of 64 bits (8B) from the memory channels.
Dual Channel (DC)
Data will be accessed in chunks of 128 bits from the memory channels. Dual
channel provides better system performance because it doubles the data transfer
rate.