From chemistry-request@server.ccl.net Wed Mar 29 15:15:03 2000 Received: from helix.nih.gov (helix.nih.gov [128.231.2.3]) by server.ccl.net (8.8.7/8.8.7) with ESMTP id PAA12688 for ; Wed, 29 Mar 2000 15:15:03 -0500 Received: (from mn1@localhost) by helix.nih.gov (8.9.3/8.9.3) id PAA1761713; Wed, 29 Mar 2000 15:15:02 -0500 (EST) Date: Wed, 29 Mar 2000 15:15:02 -0500 From: "M. Nicklaus" To: Laurence Lavelle cc: CCL , "M. Nicklaus" Subject: Re: CCL:Athlon vs Intel performance In-Reply-To: <4.2.0.58.20000328184133.00ad79a0@mbi.ucla.edu> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII For what it's worth: We've run one single direct speed comparison (I wouldn't call it a benchmark) so far, running the same Titan calculation on both a 600 MHz Pentium III (non-Coppermine) and an 800 MHz AMD K7 (Athlon) system, both running under Windows 98. (The job was a single point energy calculation at the LMP2/6-31G** level for a nucleoside analog.) Time for completion (as per program output, but in agreement with wall time): 600 MHz Pentium III - 7:05 h 800 MHz Athlon - 2:25 h Correcting (linearly) for the difference in clock rate, the Athlon is still faster (for this job!) by a factor of 2.2. Specs: 600 MHz Pentium III - 100 MHz FSB, 512 MB PC100 RAM, 27 GB ATA/66 7,200rpm HD 800 MHz Athlon - 100 MHz FSB, 256 MB PC100 RAM, 27 GB ATA/66 7,200rpm HD However, we've had quite a few stability problems with the Athlon system so far (both in Titan and in general), but we think these are more likely related to hardware driver problems in Windows 98 than to true hardware instability. All in all, YMMV. Marc ------------------------------------------------------------------------ Marc C. Nicklaus National Institutes of Health E-mail: mn1@helix.nih.gov Bldg 37, Rm 5B29 Phone: (301) 402-3111 37 Convent Dr, MSC 4255 Fax: (301) 402-2275 BETHESDA, MD 20892-4255 USA http://rex.nci.nih.gov/RESEARCH/basic/medchem/mcnbio.htm Laboratory of Medicinal Chemistry, National Cancer Institute ------------------------------------------------------------------------