[BALU] 64 bit systems

Mr. Panzer panzermkz at hotmail.com
Fri Jun 8 11:36:18 CDT 2007

ok so even after the limits are put in.  It is still a hugh number.  Like I 
won't have a 100 gig ram cap any time soon.  then would this matter for 
64bit systems as it stands right now?


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>From: Thomas Stover <thomas at wsinnovations.com>
>Reply-To: members at lists.bham-lug.org
>To: members at lists.bham-lug.org
>Subject: Re: [BALU] 64 bit systems
>Date: Fri, 08 Jun 2007 11:10:00 -0500
>2 to the 48th power divided by 8 = max number of RAM bytes. There may be 
>other limitations added by the os though. Windows limits that number a 
>great deal.
>Mr. Panzer wrote:
>>ok so how much ram we talking about?
>>>From: Thomas Stover <thomas at wsinnovations.com>
>>>The physical address space is 48 bits, so that limits the amount of real 
>>>ram in the system. However from a process's point of view the "virtual" 
>>>address space is 64 bits, and that could still be utilized with file 
>>>mapping and /or  NUMA  machines.
>>>jim wrote:
>>>>Is not the address space only 48 bits, 256 terabytes
>>>><http://en.wikipedia.org/wiki/Tebibyte>.    (I am looking foward to
>>>>buying 1 terabyte[1000 gigabytes] surplus memory). and the actual Ram 
>>>>only 40 bit addressing or just 1 terabyte of RA.
>>>>But the registers and data width are 64 bits are they not.
>>>>I think the 40 and 48 restrictions are only for memory ops.
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