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All about Windows XP Hardware Requirements

www.microsoft.com/windowsxp/sysreqs/pro.mspx
Windows XP Editions Here's What You Need to Use Windows XP Professional...

www.microsoft.com/windows/windows-vista/get/upgrade-advisor.aspx
Windows Vista Essentials This information is formatted for display on your mobile browser. For full details and purchase information, visit windowsvista.com from your PC. System Requirements...

www.it.jhu.edu/desktop/desktopmanagement/xp/hardwarereqs.html
This article contains information about the minimum hardware requirements for Windows XP Home Edition and Windows XP Professional. If you are installing Windows XP over a network, you may need additional available hard-disk space. The minimum hardware requirements for Windows XP Home Edition are:

doit.missouri.edu/hardware/
Recommended hardware specification for the CFS service This document has been withdrawn. Hardware requirements for CFS clients are now listed in the document Configuring a Desktop PC as a Private CFS Client.