<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi Pascal,<div class=""><br class=""></div><div class=""> I'd suggest having 8 Gbytes of memory, although 16 Gb would be better. With big maps (say 500 x 500 x 500) grid points and fitting a few hundred thousand atoms you can use over 4 Gbytes of memory and performance can get poor if you have too little memory for all the apps running on your machine. Chimera is single-threaded so multiple cores won't help much, except to avoid resource contention with other running applications. On-board intel graphics is quite reasonable for medium size maps and tens of thousands of atoms, but for your larger systems an Nvidia or AMD gaming type mid-range graphics cards ($100) will be much (2 - 5 times) faster to rotate and move the models. This web page shows how well various graphics cards perform with Chimera</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span><a href="http://plato.cgl.ucsf.edu/trac/chimera/wiki/benchmarks" class="">http://plato.cgl.ucsf.edu/trac/chimera/wiki/benchmarks</a></div><div class=""><br class=""></div><div class="">If you wanted some really fast graphics, a Geforce GTX 970 for $300 is a good deal.</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span><a href="http://www.videocardbenchmark.net/high_end_gpus.html" class="">http://www.videocardbenchmark.net/high_end_gpus.html</a></div><div class=""><br class=""></div><div class=""> Tom</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><div><blockquote type="cite" class=""><div class="">On Mar 15, 2016, at 2:54 AM, Pascal Albanese wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Dear staff,<div class="">we need some advice about the computational power required by the software to perform several operations/processing with big volumes obtained by cryoEM at high resolution. For example the fitting of several pdb crystal structure (n=20-30) into a single volume at high resolution of a protein complex (MW > 1.2 MDa).</div><div class="">What kind of graphics power do we'll need to run Chimera properly with this kind of structures? and CPU/RAM performance?</div><div class="">If you have any suggestion.</div><div class=""><br class=""></div><div class="">Thanks in advance for your help,</div><div class=""><br class=""></div><div class="">all the best,</div><div class=""><br class=""></div><div class="">Pascal<br class=""><div class=""><div class=""><br class=""></div>-- <br class=""><div class="gmail_signature"><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><div style="margin: 0cm 0cm 0.0001pt;" class=""><font face="times new roman, serif" size="2" class="">Pascal Albanese, </font></div><div style="margin: 0cm 0cm 0.0001pt;" class=""><font face="times new roman, serif" size="1" class=""><b class="">PhD student</b>, Università di Padova<br class=""></font></div><div style="margin: 0cm 0cm 0.0001pt;" class=""><font face="times new roman, serif" size="1" class=""><span style="" class="">Via Ugo Bassi 58 B, 35121 Padova, Italy</span></font></div><div style="margin: 0cm 0cm 0.0001pt;" class=""><font face="times new roman, serif" size="1" class=""><br class=""></font></div><div style="margin: 0cm 0cm 0.0001pt;" class=""><font face="times new roman, serif" size="1" class=""><b class="">Research assistant</b>, Politecnico di Torino</font></div><div style="margin: 0cm 0cm 0.0001pt;" class=""><font face="times new roman, serif" size="1" class="">Dipartimento DISAT, BioSolar Lab</font></div><div style="margin: 0cm 0cm 0.0001pt;" class=""><font face="times new roman, serif" size="1" class="">Viale Teresa Michel 5, 15121 Alessandria, Italy</font></div><div style="margin: 0cm 0cm 0.0001pt;" class=""><font face="times new roman, serif" size="1" class=""><br class=""></font></div><div style="margin: 0cm 0cm 0.0001pt;" class=""><font face="times new roman, serif" size="1" class="">Tel: 0131 229301 Fax: 0131 229344</font></div><div style="margin: 0cm 0cm 0.0001pt;" class=""><font face="times new roman, serif" size="1" class=""><br class=""></font></div></div><div class=""><div class=""><font face="times new roman, serif" class=""><img src="https://ssl.gstatic.com/ui/v1/icons/mail/images/cleardot.gif" class=""></font></div></div></div></div></div></div></div></div></div></div></div></div>
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