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Posted 08 November 2008 - 02:27 PM
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Computer CPUs are designed so that the address of any piece of data in virtual memory is tracked by a single integer register. So the total amount of data the computer can keep in its working field depends on the width of these registers. A 32 bit register size enables 232 addresses (4 GB) to be referenced. Switching to a 64 bit register increases the available address space to (approximately) 16 TB. This is why 32 bit operating systems can only use up to 4 GB of RAM, and 64 bit operating systems can use much more. (I have a 32 bit system)
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