Hi Angela, We are still at 4.0 however we are in the stages of planning to move to 5.0. I'm not positive about this but I don't believe there is a x64 XenApp 5 for 2003. I think you will need to go to 2008 for x64. We have HP 460c G1 and G5 blades that are dual quad core running with 16gb of ram. We have been running these for almost a 1.5 years with little issue. We have them running Office and IE applications. We easily can get 200 sessions on each server with little performance drop(a 60/40 mix of Normal and Power users). When load testing we find Disk I/O is the first bottleneck we run into before memory or CPU becomes an issue. Your experience will likely vary but this hardware config will serve you well. Bill From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of Angela Smith Sent: Friday, July 03, 2009 3:49 AM To: thin@xxxxxxxxxxxxx Subject: [THIN] Tuning Windows 2003 x64 XenApp 5 ADM's Hi Does anyone have a tuning guide or ADM files for tuning Windows 2003 x64 with XenApp 5? Im hoping to manage it all in AD Group Policy. I looked at True Control Templates V2.004 but its quite old so may not have all the newer updates. Also, whats the sweet spot for RAM for Windows 2003 x64 XenApp5. My hardware is DL380G5 with Dual Quad core CPU's. Thanks Angela ________________________________ Click here to find out more POP access for Hotmail is here! <http://windowslive.ninemsn.com.au/article.aspx?id=802246> Privacy Notice: This electronic mail message, and any attachments, are confidential and are intended for the exclusive use of the addressee(s) and may contain information that is proprietary and that may be Individually Identifiable or Protected Health Information under HIPAA. If you are not the intended recipient, please immediately contact the sender by telephone, or by email, and destroy all copies of this message. If you are a regular recipient of our electronic mail, please notify us promptly if you change your email address.