很流畅地玩《文明4》，CPU的配置要求为多少(GHz，双核)？？

文明4的最低配置是什么?
Operating System: Windows 2000/XP
Processor: 1.2 GHz Intel Pentium 4 or AMD Athlon processor or equivalent
Memory: 256 MB RAM (Windows 2000) / 512 MB RAM (Windows XP)
Hard Disk Space: 1.7 GB Free
CD-ROM Drive : 4X Speed
Video: DirectX 9.0c-compatible 64 MB video card with Hardware T&L support ( GeForce 2/Radeon 7500 or better)
Sound: DirectX 9.0c-compatible sound card
DirectX?: DirectX version 9.0c (included) or higher

文明4的推荐配置是什么?
Operating System: Windows 2000/XP
Processor: 1.8 GHz Intel Pentium 4 or AMD Athlon processor or equivalent
Memory: 512 MB RAMHard Disk Space: 1.7 GB FreeCD-ROM
Drive : 4X Speed Video: 128 MB Video Card w/ DirectX 8 support (pixel & vertex shaders)
Sound: DirectX 9.0c-compatible sound card
DirectX?: DirectX version 9.0c (included) or higher