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Hi Jan, We acquired a room full of computers to support crystallographic computing. They are all linux based (I highly recommend CentOS), 64bit, 4GB memory, xeon processors (in boxes provided by Dell). We DO have the 32 bit compatibility libraries, so if you encounter 32-bit only executables, they should (should is a four-letter word, in spite of what you think when you count :-) work fine. We run most of the crystallographic software, perhaps I could say 'all I am aware of' and we have not encountered problems doing so. Specifically, CCP4, coot, CNS, HKL2000, phenix, the Uppsala suite, etc etc. It is my understanding from the HKL2000 web site that there may be problems with that program on 64 bit machines, but it surprised me because we have not seen any problems. Now, setting these things up (with the concept that you want to be able to run 64-bit and 32-bit executables on the same platform), that was a bit involved. It works fine with CentOS, but not with all other linux flavors and I shall refrain from publically chastising other flavors. You can save yourself a lot of time, sweat and tears to work with the correct one from the beginning. The only question I cannot answer is what happens when memory > 4 GB. No experience. Hope this helps. Mark Mark van der Woerd, PhD Research Scientist II Dept. of Biochemistry and Molecular Biology Colorado State University Fort Collins, CO 80523 Phone (970) 491-0469 ? -----Original Message----- From: Jan Abendroth <[log in to unmask]> To: [log in to unmask] Sent: Fri, 12 Sep 2008 10:18 am Subject: [ccp4bb] xeon, 64 bit etc Hi all, we are looking into a multicore Xeon number cruncher with loads of memory. Are there any known issues we should consider regarding large memory (>4GB), 32bit vs. 64bit, and ccp4 or other crystallographic programs running on these systems? Only thinking linux at this point... Thanks a lot for any input! Jan -- Jan Abendroth deCODE biostructures Seattle / Bainbridge Island, WA, USA work: JAbendroth_at_decode.com home: Jan.Abendroth_at_gmail.com