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Subject: Re: Sorry about ignorance. Are 64-bit comps X2 speed for chess?

Author: Mathieu Pagé

Date: 08:49:19 12/09/03

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On December 09, 2003 at 11:16:02, stuart taylor wrote:

>Is 2.2 Ghz. of a 64-bit computer a similar speed for chess as is 4.4 is it were
>a 32-bit one?
>If not, what?
>S.Taylor

Hi!

No, it is not.

64-bit computer are not twice as fast as 32-bit ones. The number of bit
represent the natural lenght of an number on a cpu. Since chess engines use lot
of 64 bits numbers they will run faster on 64 bits machines because on 32-bit
machines they have to do some trick to do 64 bits maths that are natural on a 64
bit cpu.

I dont think the improvement will be in the range of 2x speed up. Anyway it will
vary from diffrents engines.

Mathieu



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