.... A really common question is about system requirements for Civil 3D, here is a list that Autodesk put together to help us out....
The following links provide the recommended system requirements for AutoCAD® Civil 3D® products.
System requirements for AutoCAD® Civil 3D® 2012 (current release)
System Requirements for 2011
For 32-Bit AutoCAD Civil 3D 2011
Windows® 7 Enterprise, Ultimate, Professional, or Home Premium (32-bit); Windows Vista® Enterprise (SP1 or SP2, 32-bit); or Windows® XP Professional (SP3, 32-bit).
Intel® Pentium® 4 processor or AMD Athlon, 2.0 GHz or faster; or Intel or AMD dual core processor, 2.0 GHz or faster.
1 GB RAM minimum required, 4 GB RAM minimum recommended.
7 GB disk space with 2 GB free after installation.
1,280 x 1,024 true color video display adapter (true color) 128 MB or greater, Pixel Shader 3.0 or greater, Direct3D®-capable workstation-class graphics card. 1,600 x 1,200 or greater recommended. Multiple monitors are supported.
Microsoft® Internet Explorer® 7.0 or later.
DVD drive.
For 64-Bit AutoCAD Civil 3D 2011
Windows 7 Enterprise, Ultimate, Professional, or Home Premium (64-bit); Windows Vista Enterprise, Business, Ultimate (SP1 or SP2, 64-bit); or Windows XP Professional x64 Edition (SP2, 64-bit).
AMD Athlon 64, AMD Opteron, Intel® Xeon with Intel® EM64T support, Intel® Pentium® 4 with Intel EM64T support.
4 GB RAM minimum required, 8 GB RAM minimum recommended.
7 GB disk space with 2 GB free after installation.
1,280 x 1,024 true color video display adapter (true color) 128 MB or greater, Pixel Shader 3.0 or greater, Direct3D®-capable workstation-class graphics card. 1,600 x 1,200 or greater recommended. Multiple monitors are supported.
Microsoft® Internet Explorer® 7.0 or later.
DVD drive.
Notes:
Microsoft® Windows® 7 is recommended.
Microsoft® Windows Vista® offers better memory management over Microsoft® Windows® XP.
64-bit operating systems are recommended over 32-bit operating systems because of the larger amount of available memory for applications.
System requirements for AutoCAD® Civil 3D® 2010
System requirements for AutoCAD® Civil 3D® 2009
System requirements for AutoCAD® Civil 3D® 2008
The following links provide the recommended system requirements for AutoCAD® Civil 3D® products.
System requirements for AutoCAD® Civil 3D® 2012 (current release)
System Requirements for 2011
For 32-Bit AutoCAD Civil 3D 2011
Windows® 7 Enterprise, Ultimate, Professional, or Home Premium (32-bit); Windows Vista® Enterprise (SP1 or SP2, 32-bit); or Windows® XP Professional (SP3, 32-bit).
Intel® Pentium® 4 processor or AMD Athlon, 2.0 GHz or faster; or Intel or AMD dual core processor, 2.0 GHz or faster.
1 GB RAM minimum required, 4 GB RAM minimum recommended.
7 GB disk space with 2 GB free after installation.
1,280 x 1,024 true color video display adapter (true color) 128 MB or greater, Pixel Shader 3.0 or greater, Direct3D®-capable workstation-class graphics card. 1,600 x 1,200 or greater recommended. Multiple monitors are supported.
Microsoft® Internet Explorer® 7.0 or later.
DVD drive.
For 64-Bit AutoCAD Civil 3D 2011
Windows 7 Enterprise, Ultimate, Professional, or Home Premium (64-bit); Windows Vista Enterprise, Business, Ultimate (SP1 or SP2, 64-bit); or Windows XP Professional x64 Edition (SP2, 64-bit).
AMD Athlon 64, AMD Opteron, Intel® Xeon with Intel® EM64T support, Intel® Pentium® 4 with Intel EM64T support.
4 GB RAM minimum required, 8 GB RAM minimum recommended.
7 GB disk space with 2 GB free after installation.
1,280 x 1,024 true color video display adapter (true color) 128 MB or greater, Pixel Shader 3.0 or greater, Direct3D®-capable workstation-class graphics card. 1,600 x 1,200 or greater recommended. Multiple monitors are supported.
Microsoft® Internet Explorer® 7.0 or later.
DVD drive.
Notes:
Microsoft® Windows® 7 is recommended.
Microsoft® Windows Vista® offers better memory management over Microsoft® Windows® XP.
64-bit operating systems are recommended over 32-bit operating systems because of the larger amount of available memory for applications.
System requirements for AutoCAD® Civil 3D® 2010
System requirements for AutoCAD® Civil 3D® 2009
System requirements for AutoCAD® Civil 3D® 2008