How much memory should a PC use when idle?

Windows reserves 1.8 to 2.4 GB of ram no matter how much is actively loaded. Reserved means the memory is assigned even if it is not actively being used. In an idling system with nothing but Windows and its drivers loaded (NO support programs) the system should be using roughly 0. read more

When the computer is idle it would use the amount of RAM required by system processes. So that depends on your operating system. For example it should be around 15-20% of your total memory for windows 10. Most Linux distributions use less than what windows would use, so that would be around 10% of your total memory. read more

When my PC is idling, my RAM usage is at around 22% - 25% usage or about 3.5GB - 4.0GB used. Also when I am just using Google Chrome it goes up to 28% - 30% usage or 4.5GB used. I am running Windows 7. read more