32/64 bit AMD question

[Phillip Susi]

I think the only difference between the two sockets is the latter has 
support for dual memory bank interleaving.  It is still fully 64bit.  I 
also have an older 754 Athlon 64 3200+.  I'm not sure if it really makes 
a difference or not, but I'm running it in 64 bit mode.

Russell Cook wrote:
> 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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