Each cpu should have a serial number on it. With xeons or other cpus, it's always ideal to get two cpus with the same batch code and an incremental serial number, i.e. cpu0=serial#1122445, cpu1=serial#1122446 (or whatever). -- Chris Scheidecker Associate Systems Administrator cscheidecker at iexposure.com Internet Exposure, Inc. http://www.iexposure.com 612.676.1946 x33 Web Development-Web Marketing-ISP Services ------------------------------------------