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64 bit X86 CPU

I have seen in some documentations about computers, where they say: servers with 64 bits x86 CPU ,32 bits with x86 CPU, and 64 bit processors.

Can someone explain what they mean by those numbers?
I thought they use "bits" just for memory size not for processors.

5 Solutions

Please check the link
64 bit simply means the CPU(Processor) has the ability to process data twice as fast as a 32 bit CPU.  However in order to fully take advantage of a 64 Bit processor you need to have a 64 Bit Operating System along with 64 Bit compiled applications.

For a more detailed description check out this link:  http://www.build-your-own-computer-tips.com/64-32-bit-processors.html
Hi Patmac951,

Actually not very true because its more than twice;
A 64-bit register can store 18 446 744 073 709 551 616 different values
A 32-bit register can store 4,294,967,295

Obviously this means 64 bit can do math with larger numbers, and be more efficient with smaller numbers
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jskfanAuthor Commented:
can you please explain the meaning of each statement:
64 bits x86 CPU
32 bits with x86 CPU
64 bit processors.
PowerEdgeTechIT ConsultantCommented:
64 bits x86 CPU - this is not possible, because an x86 (32-bit) processor cannot run 64-bit OS's
32 bits with x86 CPU - an x86 processor is 32-bit
64 bit processors - all 64-bit processors (except for Intel Itanium) can run 32-bit OR 64-bit OS's.

The processor is what provides support for 32-bit or 64-bit instructions.  Along with 64-bit instructions, only 64-bit hardware can run 64-bit software (including OS), and only 64-bit OS's can use more than 4GB of RAM (memory).
jskfanAuthor Commented:

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