In article , Dustin Harper
says...
It is pretty much wasted. It is a limitation of the 32 bit operating
systems. It can only address 4 GB of memory. This includes the BIOS, I/O,
video memory, etc. So, you have ~3.2 GB of RAM left in that address space.
In order to fully use the 4 GB of RAM, you'd need to upgrade to a 64 bit OS.

But for upgrade to 64-bit OS, the hardware must even be 64-bit.

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