Since A6 CPU and heatsink are hardware, I'm not sure where you think the noise is being generated? I think the lowering of the noise floor...
You will always pay for what you don't know!
this is probably the best (A6 vs 250) comparison I've read. I ended up returning my 250 for many of the stated reasons but also because usability....
NFS is typically used in Unix environments and SMB in Microsoft. There could be performance differences when copying files but not too much...
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