Ever wondered which server model numbers support the operating system your are going to deploy. I found these handy webpages for Dell and HP which lists models with supported operating systems.
|Operating System Support Matrix for Dell PowerEdge Systems|
|Windows support for HP ProLiant Servers|
Another great resource is the Windows Server Catalog which will tell you about the Microsoft ‘Certified’ and ‘Works With’ status of other servers.
The Windows Server Catalogue also lists the status of a number of third party software packages.
Hope this helps