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Subject: Re: Differences between Opteron and Athlon 64

Author: Russell Reagan

Date: 20:22:16 12/03/03

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On December 03, 2003 at 20:15:26, K. Burcham wrote:

>
>the Athlon 64 FX-51 uses a 940-pin package, similar to AMD's Opteron, while the
>Athlon 64 3200+ uses a 754-pin package.  The Athlon 64 FX-51 also has a memory
>controller that is twice as "wide" as the 3200+; 128-bits vs. 64-bits
>respectively.  The Athlon 64 FX-51 also requires registered memory to function,
>whereas the Athlon 64 3200+ can use standard unbuffered DDR memory.
>
>the FX-51 is housed is ceramic packaging material, ala the Thunderbird.  The
>Athlon 64 3200+ is using organic packaging like the current generation of Athlon
>XPs.
>
>
>http://www.hothardware.com/hh_files/CCAM/a64fx_51_launch.shtml

That is a good article, and it answers some of the questions, but it is still
unclear which processor would be best for different circumstances. It doesn't
really address Opteron vs. Athlon 64. We have:

Opteron for servers
Opteron for desktops
Athlon 64
Athlon 64 FX

It seems clear that the Athlon 64 FX is better than the Athlon 64, but whether
or not it is worth the significant price increase, I don't know (it doesn't seem
THAT much better). Also, the main improvements seem to be memory bandwidth,
which hasn't been very important for chess programs.

Some of the lower end Opterons can be had pretty cheap, if someone wanted to
just test one out. I don't know if it would be better to get a cheap one to play
with, to get an expensive one now, or to put the whole thing off and wait until
newer ones are available. Surely 2.2 GHz is not as high as they will go.



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