Will a ram upgrade require a win 10 reinstall?

No.

Just be aware that you will lose hard drive space, for hibernation file and paging file.
 
No it will not. Win 10 seems to be pretty tolerant actually, in that you can change a lot without it really caring.
 
Just make sure you back up your old ram first :D

Joking aside, I don't think there's ever been a need to reinstall the OS for a RAM upgrade. You'll be fine.
 
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