
Other factors include the OS not supporting the amount of memory installed on the computer. Once the memory sectors are mapped, they are no longer available to the OS.

Here, the remaining 0.8 GB of memory is mapped by other components such as BIOS, GPU, and other devices. The 32-bit OS is not programmed to handle more than 4 GB of memory, resulting in a total usable memory no greater than 3.2 GB. The factors affecting the usable memory can be any of the above-mentioned.

