32/64 bit AMD question

[DebianTux23]

https://www.scientificlinux.org/

2005/10/18, Russell Cook <bike_oz at yahoo.com.au>:
>  Hi folks,
>  firstly thanks to the devs and all in the Ubuntu community and canonical
> for a great release in Breezy, I'm running it on 6 machines and it is
> getting more and more flawless and seamless with every release - well done
> guys (non-gender specific ones :- )
>
>  My question relates to the 64 bit versions and the performance of the AMD
> cpu.
>
>  I have an AMD 64 system, but with the older 754 pin layout, not the full
> 939 pin 64 bit system. Given this system doesn't have all the pins for full
> 64 bit access to the motherboard (is it only memory????), will I see a
> performance benefit if I migrate to the 64 bit version of Ubuntu? Or, is
> this chip a little crippled, and therefore 32 bit (which in theory has no
> inherent performance penalty in AMD's implementation),  and 64 bit
> performance are roughly comparable in this system so there'd be no benefit
> in going to the 64 bit version?
>
>  Maybe put another way, what is the performance difference in 64 bit mode
> compared to 32 bit, of the 754 pin and the 939 pin AMD Athlon64's for the
> same clock speed?
>
>  I hope that makes sense.
>
>
>  Kind Regards Russell
>  ==================
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