CONSULT: win10 32bit on x86-64

I currently have an laptop running linux, and I'm considering dual-booting to Windows 10. I try to decide whether to take 32bit or 64bit os.

If I understood correctly, 64bit Windows might be better than 32bit for heavy RAM usage, but worse for light usage. is that correct?

I do have a 8GB memory card (so 32bit can't map it all), but I don't intend to use much memory on the Windows, does it still make the 64bit faster?

Last but not least (least trivial maybe), I read that with the shift to 64bit processors, Intel introduces 2 additional changes to their x86 processors:

1) adding general-purpose registers

2) altering the stack-based calling convention, so that less "store" and "load" instruction are executed.

Theoretically, a 32bit OS may check if it's running on a 64bit processor in order to benefit from those changes, right? Does Windows 10 (32bit) do that? can it be done for 32bit programs on a 64bit Windows?

Thanks ahead

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