How much RAM does Windows 10 take up?

2GB of RAM is the minimum system requirement for the 64-bit version of Windows 10.

Why does Windows 10 use more RAM?

All of the compressed memory that Windows 10 creates is stored in the System process. This is why it appears to balloon over time. The longer you have your computer running (and the more applications or browser tabs you launch), the more data in memory Windows will need to compress.