Finally the Duke Nukem Forever specs have been released by Gearbox
Minimum Specifications
OS: Windows XP/Vista/7
Processor: Intel Core 2 Duo @ 2.0 Ghz / AMD Athlon 64 X2 @ 2.0 Ghz
Memory: 1 Gb
Hard Drive: 10 Gb free
Video Memory: 256 MB
Video Card: nVidia GeForce 7600 / ATI Radeon HD 2600
Sound Card: DirectX Compatible
Recommended Specifications
OS: Windows XP/Vista/7
Processor: Intel Core 2 Duo @ 2.4 Ghz / AMD Athlon 64 X2 @ 2.6 Ghz
Memory: 2 Gb
Hard Drive: 10 Gb free
Video Memory: 512 MB
Video Card: nVidia GeForce 8800 GTS / ATI Radeon HD 3850
Sound Card: DirectX Compatible