On Oct 1, 2008, at 4:27 PM, Mike Miller <mbmiller at taxa.epi.umn.edu>  
wrote:

> On Wed, 1 Oct 2008, Dan Armbrust wrote:
>
>> Just don't get confused by the two different types of 64 bit  
>> processors.
>>
>> As long as you are talking about AMD64, or x86-64 - pretty must all  
>> of
>> the distros support it.  This is what most people mean when they  
>> say 64
>> bit.  Pretty much every common processor supports the AMD64  
>> extensions
>> these days.
>>
>>
>> There is, however, another 64 bit architecture - the Intel Itanium  
>> chips
>> - not nearly as many distros support that - I see that redhat /  
>> fedora
>> does http://fedoraproject.org/wiki/Architectures/IA64
>>
>> Those processors are typically much more expensive, however.
>
> Right about IA64.  But haven't the 64-bit Xeon's gotten a lot of
> marketshare lately?  I think what you have written is what I would  
> have
> written a couple of years ago but now that I am shopping again, it  
> looks
> like Xeon x5400 series are 64-bit quad-core chips that come on a lot  
> of
> server systems.
>
> So will software compiled for AMD x64 work just as well on Xeon  
> x64?  It
> looked like the Ubuntu web page on 64-bit OS was making no important
> distinction between AMD and Intel.
>
> Mike
>
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And while you're discussing this subject, how does zLinux on IBM/S390  
fit in?

-Brady