I'm curious if there are people on this list that use dual Opterons for their processing. We are in the process of trying to purchase several dual Opterons to replace our aging P3 cluster and we have a few questions regarding the upgrade. First, do you know if the opteron kernel will allow larger memory for user space in 64bit mode that just 4 GB? We have two dual Xeon's with 4gb of memory which we could never get more than 3.5 GB recognized by the 2.4 kernel. Second, regrading power and heat, what steps have you taken to remedy the heat generated by the Opterons and what kind of electrical upgrades have you done? We have a VA Linux rack with about 20U's left which will house the Opterons. It has 2 220 volt power rails (we only use one) that delivers power to a 4U APC (I forget the model number) unit, a 4U quad Xeon server, 2 switches and a 4U RAID array. Thanks for any suggestions you may provide. -- Jeremy Mann jeremy@biochem.uthscsa.edu University of Texas Health Science Center Bioinformatics Core Facility http://www.bioinformatics.uthscsa.edu Phone: (210) 567-2672 -- Jeremy Mann jeremy@biochem.uthscsa.edu University of Texas Health Science Center Bioinformatics Core Facility http://www.bioinformatics.uthscsa.edu Phone: (210) 567-2672