By now many of you have probably used the Exchange 2010 Mailbox Role Requirements calculator to help design your mailbox architecture. In particular, one area that is critical in your architecture is the CPU load that will be placed on your mailbox servers. To that end the Exchange Product Group provided guidance on how to calculate a mailbox's impact on a server. However, this guidance was based on a particular server and processor architecture. More than likely you aren't deploying this particular server platform, therefore, in order to utilize the guidance effectively you have to normalize your server against the baseline server. This involved using a value, the SPECInt 2006 Rate value, found on www.spec.org, in the normalization calculation. To help simplify this process, we are releasing the Exchange Processor Query tool to enable you to quickly locate the SPECInt 2006 Rate value for your server.
Read more at source: http://msexchangeteam.com/archive/2010/10/27/456738.aspx
Download the tool: http://msexchangeteam.com/files/12/attachments/entry456737.aspx