It took me a second to realize you were talking about ram.
Because win10 will eat 1.4gb in about five minutes of disk cacheing.
Yes, as any good OS should. Windows finally got onto this bandwagon 30-years later. But it also releases this memory as needed for apps. A lot of memory-management tricks used in Win10 came from thin-client craze back in '90s with WindowsFLP and WindowsThinPC. I actually set up about 10,000 of these back then. Well, actually just 5, then IT Dept. cloned them throughout empire.
I've got Win10-LTSB running on Dell D620 laptop just fine (2.5gb RAM, 2.0ghz Core2Duo CPU). As revealed in other "regularly hanging thread", there's tonnes of extra apps and background services that's not needed. Removing and disabling those frees up HUGE amount of memory and CPU resources. All these phone-home-to-mothership stuff is useless; slows down system. Can even cause regular freezes and outright crashes. Just say NO to bloatware.