<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN" "http://www.w3.org/TR/REC-html40/strict.dtd"><html><head><meta name="qrichtext" content="1" /><style type="text/css">p, li { white-space: pre-wrap; }</style></head><body style=" font-family:'Arial'; font-size:10pt; font-weight:400; font-style:normal;">I hope that 4MB RAM are actually 4GB RAM...:-)<br>
Anyway, in my opinion you need at least 8GB, or you will miss systems containing more than about 500 electrons. If you can afford it, the best choice would be 8 cores and 16 GB...<br>
Hope this help<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>Giuseppe<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>On Monday 30 November 2009 17:08:54 mohsen modaresi wrote:<br>
> Dear users<br>
> These are my choices, System with 4cores and 4MB RAM and 8cores with 4MB<br>
> RAM, Is there many deferences between this two system for runing Q.E?<br>
> Thanks<br>
><br>
><br>
> On Mon, Nov 30, 2009 at 1:05 PM, mohsen modaresi<br>
><br>
> <modaresi.mohsen@gmail.com>wrote:<br>
> > Dear Lorenzo<br>
> > Thanks for your answer<br>
> ><br>
> > Mohsen Modaresi<br>
> ><br>
> > On Mon, Nov 30, 2009 at 12:17 PM, Lorenzo Paulatto <paulatto@sissa.it>wrote:<br>
> >> Replying to message "[Pw_forum] Minimum requirement system" from mohsen<br>
> >><br>
> >> modaresi (30/11/09):<br>
> >> > I want buy a new computer for my PWscf calculation<br>
> >> > what is your suggestion? (minimum requirement please)<br>
> >> > Thanks for your answers<br>
> >><br>
> >> Dear Mohsen,<br>
> >> it depends on the size of the system you are going to study, and on what<br>
> >> you want to study.<br>
> >><br>
> >> I usually run small molecules (less than 20 electrons) on my laptop,<br>
> >> systems with about 100 electrons on at least 32 processors (with<br>
> >> dedicated high-speed network connection and filesystem), systems with<br>
> >> about 1000 electron require at the very least 128 processors.<br>
> >><br>
> >> best regards<br>
> >><br>
> >><br>
> >> --<br>
> >> Lorenzo Paulatto<br>
> >> SISSA & DEMOCRITOS (Trieste)<br>
> >> phone: +39 040 3787 511<br>
> >> skype: paulatz<br>
> >> www: <br>
> >> http://people.sissa.it/~paulatto/<http://people.sissa.it/%7Epaulatto/><br>
> >><br>
> >> *** save italian brains ***<br>
> >> http://saveitalianbrains.wordpress.com/<br>
> >> _______________________________________________<br>
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> >> Pw_forum@pwscf.org<br>
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<br>
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