Technically the 4GB RAM is excellent to run the Windows 11 operating system. Still, many people have already installed some software, office suites, and games into their pc system, and therefore Windows 11 will not be supported on those systems. So, if you want to install Windows 11 on 4GB RAM, you have to free up your system space. Well, how much RAM space do you need to run the Windows 11 operating system depends on your pc; if you have a 32bit architecture pc, then you will need less RAM space, while at the same time, if you have a 64-bit architecture pc, then you will need much more RAM space. On average, you will approximately need 4GB of RAM space to run the Windows 11 operating systems.