Significant testing and performance characterization by both Microsoft and HP has led to a set of prescriptive solution configurations and documented growth paths for deployment of Microsoft SharePoint Portal Server 2003 and Windows SharePoint Services.  This enables a prospective customer to pick a tested and documented solution that best matches their current needs, and to grow that solution over time to suit specific needs as they evolve.

HP SharePoint hardware sizing tool is a great place to begin hardware sizing estimates. You can also reference the SharePoint performance summary as a baseline for your Portal.

The MOSS 2007 Beta 2 tests and sizing will be availble in 4-5 weeks.