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Subject: Re: Program in 32-bit, run on 64-bit OK?
Date: Fri, 16 Nov 2012 09:23:12 +0800
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On Fri, 16 Nov 2012 07:08:58 +0800, Stuart <DerTopper@web.de> wrote:

>
> Wrong. Typical 64 bit processors have either a 36 bit or a 40 bit  
> physical address bus (40 bits are 1 TB, an almost incredible amount of  
> RAM, wikipedia mentions that some AMD chips even offer a 48 bit memory  
> bus). Note that bus width and register width do not have to have a  
> one-to-one relationship. The early 286 processor had a register width of  
> 16 bits but an address bus with 24 bits (4MB), so they had to invent  
> this segmentation model in order to compute a 20bit address from two 16  
> bit registers. Twenty years later, the segmenation unit is still present  
> at the Intel architecture while the numbers have been reversed: now the  
> 36 or 40 bit physical address is computed from a 16 bit value and a 64  
> bit value. Sounds like overkill, and yes, it is. That's just for  
> backwards compatibility for applications from 1985.
>
> Regards,
> Stuart

Thanks. I am not too sure now :-(

I have an old Intel Pentium 4 1500Mhz PC. Can it run 64-bit OS ?


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