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<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><br>
<font color=black><span style='color:black'>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?</span></font><br>
<br>
<br>
<br>
</span></font><font size=2 color=navy><span style='font-size:10.0pt;color:navy'>The
funny thing is, it is exactly the memory interface that is different between
the two. The 754 socket only does single channel memory (64 bit path)
whereas the 939 CPU’s are dual channel (128 bit path). The 64 bit
part of the processor is the same. The performance difference will be the
memory bandwith.</span></font><br>
<br>
<o:p></o:p></p>
</blockquote>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Thanks Lewis, does that mean that in 32bit mode the chip only does
32bit memory accesses but in 64 bit mode the 754pin chip does 64 bit and 939
pin chip does 128bit (memory access not calculations)?<br>
<br>
If true, then 64 bit mode should be faster than 32bit in both chips, but the
939 will be faster (by the memory access time) then the 754. Do I have this
understanding correct or am I still missing something?<br>
<br>
Regards Russell. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>That is correct. However, in most
tests that I’ve seen on the review sites, the performance increase
between 32 and 64 bit mode varies upon the application one is doing.
Sometimes 32 bit mode is just as fast, if not slightly faster than 64 bit, and
vice-versa. The biggest issue that you may want to look at is to see if
there are 64 bit versions of the programs/applications that you want to
run. For example, there is not a 64 bit version of Flash that I’m
aware of (one can do a chroot environment to run 32 bit applications in 64 bit
Linux, but that is a little over my head). Also, some drivers do not have
a 64 bit version of them, but this is thankfully being worked on and the likelihood
of having a device that won’t work on the 64 bit version of Linux is becoming
less and less of an issue.<o:p></o:p></span></font></p>
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