The Sims 3 gives you control over the lives of lives and homes of the eponymous Sims, and has grown huge with more expansions than you would know what to do with, adding nightclubs, universities and apartment buildings. An Intel Core 2 Duo E4400/AMD Athlon 64 X2 Dual Core 4000+ and a GeForce 7600 GT/Radeon HD 6450 is all you need to get it running smoothly.
The Sims 3 Minimum Requirements
Pentium 4 processor or equivalent
For XP 2.0 GHz Pentium 4 processor or equivalent; For Windows Vista and Windows 7 2.4 GHz Pentium 4 processor or equivalent
For XP 1 GB RAM / Windows Vista and Windows 7 1.5 GB RAM (For NVIDIA ION computers, the game requires at least 2.0 GB RAM)
XP SP2 / Vista SP1 / Windows 7
128 MB Video Card with support for Pixel Shader 2.0 [Nvidia GeForce 6 series or better (GeForce 6100 and 7100 cards are not supported), and all NVidia G, GT, GTS, and GTX video cards. ATI Radeon™ series card 9500 series or better, and all ATI X, X1, and HD video cards; Intel® Graphics Media Accelerator (GMA): GMA 3-Series, GMA 4-Series]