"Intel Atom Z3775 Quad-Core" in the ASUS Transformer T100TA-H1 and it offered the Windows 10 upgrade which I accepted and it's all good.
So with an example in the office I can answer it's not an Atom problem.
I have a Windows 8 computer running on an Atom chip and it doesn't seem that Windows 10 is available for it. Search for updates goes on an endless search.

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