Saturday, 2 February 2013

Why are 32-bit architectures limited to 4 GB of RAM?

They aren't. 
32-bit architectures are not limited to 4GB of physical RAM. 

But,The limitation is 32-bits (or 4GB) of VIRTUAL address space in a single process.
It is possible for a 32-bit processor and operating system to support more than 4GB of PHYSICAL memory. 

Like..
PAE Mode on x86 processors: (
Physical Address Extension) is the most common example. 
So We can have more than 4GB of RAM, We just can't see it all at the same time.

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