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Solve : 32 Bit OS HELP?

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If you have a 32 Bit CPU I KNOW that it just meens it can process 32 Bits at a time.

But should you be running a 32 Bit Operating System or is that not how this works?
I did not unerstand what a 32 Bit Operating System was and what a 16 Bit Operating System was??Here you go....

http://en.wikipedia.org/wiki/32-bit

A LITTLE reading...
Ok I do know that if a CPU is 32 Bits that means it needs 32 Bits to run and it Process 32 Bits.

But what I read just talks about Data BUSS Width and Internal Registers Width and that is what gets me mixt up.

So am I to understand that if an Operating System is 32 Bits that the CPU MUST be 32 Bit Processor so it can talk to the Operating System?I found this article to do with 32BIT and 64bit.

Quote

By using 32 bits your processor can represent numbers from 0 to 4,294,967,295 while a 64-bit machine can represent numbers from 0 to 18,446,744,073,709,551,615. Obviously this means your computer can do math with larger numbers, and be more EFFICIENT with smaller numbers.


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