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Subject: Re: Question about hyperthreading ...

Author: Thomas Mayer

Date: 18:21:23 01/09/04

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Hi Matthew,

On January 09, 2004 at 19:16:34, Matthew White wrote:

>>> is hyperthreading for Xeon processors interesting for computerchess?
>>> If yes, I must buy a new OS because Windows 2000 is not compatible to
>>> hyperthreading.
>>>
>>> I cann't believe that with 100% engine CPU power hyperthreading give me more
>>> power! For sure for different other software (grafic software and so on) but
>>> for computer chess?
>>
>>as usual: it depends. Of course the engine will get more nps on a Dual when
>>hyperthreading is activated and 4 threads (because we have 4 virtual CPUs) are
>>useable. And this depends on the engine. To use 4 CPUs with a dual you need the
>>server version of Windows 2000. Windows 2000 and Windows XP only support 2 CPUs.
>
>I'm using XP Professional on a 2x2.4 Xeon with HT enabled, and it shows 4
>virtual CPUs. I believe that XP properly supports HT...

oh, that's new to me... anyway, I do not own a Dual Xeon, but have read much
about hyperthreading - I thought that the normal XP professional would not show
four processors - if it does, fine !

Greets, Thomas



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