The easiest way to make a ballpark comparison of Windows 8 vs. Windows 7 memory use is to install both operating systems on a 1GB RAM machine (minimum OS RAM requirement) and compare them when they’ve been rebooted multiple times, and then idled for a while.
The Windows Task Manager contains the main view of system memory through its “In Use” statistic (described in detail in this doc). The below graphics compare memory consumption on Steven’s 3+ year old netbook that he was using at the //build/ keynote recently, running Windows 7 at idle, and then with the same machine running Windows 8.
Windows 8 to use less memory
Posted on Monday, October 10 2011 @ 22:04 CEST by Thomas De Maesschalck
Microsoft blogger Steven Sinofsky reports Windows 8 will use less memory than its predecessor, you can read the details over here.