SharePoint 2013 Hardware and Software Requirements

The Hardware and Software requirements for SharePoint 2013 have not changed much from SharePoint Server 2010.

SharePoint 2013 can run on 64-bit machines which used to run SharePoint Server 2010, the change from 32-bit to 64-bit has already happened while moving from SharePoint 2007 to SharePoint 2010, hence not much changes from the infrastructure point of view.

The Following are the basic requirements to setup SharePoint 2013

Windows Server
Windows Server 2008 R2 (SP1) (64 bit)
(OR)
Windows Server 2012 Release Candidate (64 bit) Standard, or Datacenter.

SQL Server
SQL Server 2008 R2 (SP1) (64 bit)
(OR)
SQL Server 2012 (64 bit)

For a details list of Hardware and Software requirements refer to the following Microsoft technet article.

http://technet.microsoft.com/en-us/library/cc262485(v=office.15)#section4

Related Post
SharePoint 2013 Authentication
SharePoint 2013 Sites
SharePoint 2013 Communities
SharePoint 2013 Content
SharePoint 2013 Search
SharePoint 2013 Insight
SharePoint 2013 Composites
SharePoint 2013 Claim Based Authentication
SharePoint 2013 Support for OAuth 2.0
SharePoint 2013 Distributed Cache Service