You can find all requirements in MSDN:

Hardware Requirements:
ms-help://MS.VSCC/MS.MSDNVS/vsintro7/html/vxoriVisualStudioNETSystemRequirements.htm

Software Requirements:
ms-help://MS.VSCC/MS.MSDNVS/vsintro7/html/vxtbsVisualStudioNETSoftwareRequirements.htm

Note: Hardware requirements are going down while approching RTM.