Hi, would Windows 10 run smoothly on notebook with 2 GB RAM, how much ram does Windows 10 Pro leave free for use & built-in process/ services consume?
Not recommended less than 3GB, but better 4GB, it's the minimum what should have for x64 system. But x86 (32-bit) may run also, if there is only 2GB. Of course, it isn't recommended, but if there is no other way possible, then try. It will run, but most likely is slow.
I think it works, but maybe some of the menus will open more slowly. (Start, taskbar, notifications, etc.) I have one ten year old computer, came with Win XP x86, now there is Win10x64 and increased RAM to 3GB, works for surfing in internet mostly normal, only sometimes must a bit wait more than usually on other computer. But everything works. Try and if don't like, You can always go back to W7.
About 900Kb on X86 and about 1.3Gb on X64it depends on Hardware eg drivers + windows "Kernel" services fresh install. I would go for x86 because you may want to install anti-virus etc software.
It depends on what HW your running and what drivers, but a X86 should run fine also if u have a SSD that would make it a plus.