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Different numerical results from AMD and Intel processors
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Subject Author Date
Different numerical results from AMD and Intel processors jollygoodfellow 01-09-2006
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Posted by jollygoodfellow on January 9, 2006, 1:30 am
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 Hi,

I am looking for a new laptop for heavy duty numerical processing,
mostly for interger operations. The program I am developing (in C++,
.net 2003) prints out error messages on my HP laptop (ze1230) with
Athlon 1300 processor, which it never does on any of the Intel
machines. I was not able to find out the reason for this. Does anyone
have similar experience?

I do hope the newer AMD chips will not have this problem. They look
quite attractive from a price/performance point of view. But no use of
being cheap and fast if the results are not quite right. I hope this is
an isolated case, any comments?

Thanks.

JGF


Posted by Dan on January 9, 2006, 1:39 am
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 Sounds like there might be something wrong with your laptop. Possibly a
virus or hardware problem? Its very unlikely that AMD processors would
create errors when doing calculations but Intel processors would not.
> Hi,
>
> I am looking for a new laptop for heavy duty numerical processing,
> mostly for interger operations. The program I am developing (in C++,
> .net 2003) prints out error messages on my HP laptop (ze1230) with
> Athlon 1300 processor, which it never does on any of the Intel
> machines. I was not able to find out the reason for this. Does anyone
> have similar experience?
>
> I do hope the newer AMD chips will not have this problem. They look
> quite attractive from a price/performance point of view. But no use of
> being cheap and fast if the results are not quite right. I hope this is
> an isolated case, any comments?
>
> Thanks.
>
> JGF
>



Posted by Dan on January 9, 2006, 1:45 am
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I should add that a lack of sufficient voltage to the CPU can cause it to
generate errors. You should try out the program Prime 95 and run a "Torture
Test" which stresses the processor FPU
(Options--> Torture Test-->Small FFT's ) and see if any errors get
generated. You can find Prime95 at http://www.mersenne.org/freesoft.htm

Good luck

> Hi,
>
> I am looking for a new laptop for heavy duty numerical processing,
> mostly for interger operations. The program I am developing (in C++,
> .net 2003) prints out error messages on my HP laptop (ze1230) with
> Athlon 1300 processor, which it never does on any of the Intel
> machines. I was not able to find out the reason for this. Does anyone
> have similar experience?
>
> I do hope the newer AMD chips will not have this problem. They look
> quite attractive from a price/performance point of view. But no use of
> being cheap and fast if the results are not quite right. I hope this is
> an isolated case, any comments?
>
> Thanks.
>
> JGF
>



Posted by J. Clarke on February 2, 2006, 5:17 am
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jollygoodfellow wrote:

> Hi,
>
> I am looking for a new laptop for heavy duty numerical processing,
> mostly for interger operations. The program I am developing (in C++,
> .net 2003) prints out error messages on my HP laptop (ze1230) with
> Athlon 1300 processor, which it never does on any of the Intel
> machines. I was not able to find out the reason for this. Does anyone
> have similar experience?
>
> I do hope the newer AMD chips will not have this problem. They look
> quite attractive from a price/performance point of view. But no use of
> being cheap and fast if the results are not quite right. I hope this is
> an isolated case, any comments?

You say in the header "different numerical results" but in the message body
"prints out error messages". Error messages are not "different numerical
results".

Which is it? What exactly are you seeing?

--
--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net)

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