Dear Huang,

I do not know how either of these run R in particular.  However, the price
difference is because the E5540 is a newer line of chip architecture than
the W3540.  One of the differences is the speed that data can be transferred
to and from the chip (Intel now calls it the QPI, it used to be called the
front side bus or just FSB).

E5540's QPI speed is 5.8 gigatransfers per second
W3540's QPI speed is 4.6 gigatransfers per second.

You might also be interested in how much power they take.

E5540 uses a maximum 80 watts
W3540 uses a maximum 130 watts

They both handle the same type (DDR3) and speed (1066) of RAM.

If you want more details about them google

"Gainsetown" the E5540 architecture codename
"Bloomfield" the W3540 architecture codename

I doubt you would see a big performance difference either way, but I cannot
say that for certain.

I hope that at least gives you a bit more information about them.  Sorry I
cannot give a straightforward answer.

Best,

Joshua

On Thu, Aug 27, 2009 at 1:00 AM, huang min <minhuangr@gmail.com> wrote:

> Dear All,
>
> I am considering to buy a workstation. For the CPUs, I wonder whether
> anybody have the experience in choosing one for the R.
>
>
> Intel Xeon W3540 2.93 8MB/1066 QC CPU is much cheaper as compared with the
> Intel Xeon E5540 2.53 8MB/1066 QC CPU. However, its Hz 2.93 is bigger than
> 2.53. I wonder which one would run R quicker. Thank you.
>
>
>
> Huang
>
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>
> ______________________________________________
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Joshua Wiley
Senior in Psychology
University of California, Riverside
http://www.joshuawiley.com/

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