>> The case I shall use is perfectly adequate and will take either mATX or ATX.
>> It seems that the ATX again gives me more flexibility, such as 6 or 4
>> SATA.
I always go for the largest form factor board thats fits your case. Its easier to work on and the larger the board the better the heat dissipation, and as you say, you end up with more interfaces.
>
>> The motherboard allows for 4 x DIMM. At this time I'm comfortable that I need
>> 16GB. I certainly don't need 32GB but 8GB might be restricting. Is 2x8 the best
>> distribution? As opposed to 4x4 or 1x16?
Channels
en.wikipedia.org/wiki/Multi-channel_memory_architecture#Quad-channel_architecture
Split your memory across the channels the CPU supports. The Ryzen you have chosen supports two, so memory split in two dimms is good. 1 per channel.
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