The Sims 3 requires at least the following:
FOR WINDOWS XP
* 2.0 GHz P4 processor or equivalent
* 1 GB RAM
* A 128 MB Video Card with support for Pixel Shader 2.0
* The latest version of DirectX 9.0c
* Microsoft Windows XP Service Pack 2
* At least 6.1 GB of hard drive space with at least 1 GB of additional space for custom content and saved games
FOR WINDOWS VISTA & WINDOWS 7
* 2.4 GHz P4 processor or equivalent
* 1.5 GB RAM
* A 128 MB Video Card with support for Pixel Shader 2.0
* Microsoft Windows Vista Service Pack 1
* At least 6.1 GB of hard drive space with at least 1 GB of additional space for custom content and saved games
For computers using built-in graphics chipsets under Windows, the game requires at least:
* Intel Integrated Chipset, GMA 3-Series or above
* 2.6 GHz Pentium D CPU, or 1.8 GHz Core 2 Duo, or equivalent
* 0.5 GB additional RAM
FOR MAC OS X
* Mac OS X 10.5.7 Leopard or higher
* Intel Core Duo Processor
* 2 GB RAM
* ATI X1600 or Nvidia 7300 GT with 128 MB of Video RAM, or
* Intel Integrated GMA X3100.
* At least 6.1 GB of hard drive space, with at least 1 GB additional space for custom content and saved games
* This game will not run on PowerPC (G3/G4/G5) based Mac systems, or the GMA 950 class of integrated video cards.
Windows Supported Video Cards
NVIDIA GeForce series FX 5900, FX 5950 6200, 6500, 6600, 6800 7200, 7300, 7600, 7800, 7900, 7950 8400, 8500, 8600, 8800 9300, 9400, 9500, 9600, 9800 G100, GT 120, GT 130, GTS 150 GTS 250, GTX 260, GTX 280, GTX 285, GTX 295
ATI Radeon™ series 9500, 9600, 9800 X300, X600, X700, X800, X850 X1300, X1600, X1800, X1900, X1950 2400, 2600, 2900, 3300, 3450, 3650, 3850, 3870 4850, 4870, 4890
Intel(R) Graphics Media Accelerator (GMA) GMA 3-Series, GMA 4-Series
Laptop versions of these chipsets may work, but may run comparatively slower. Standalone cards that are installed in vanilla PCI slots (not PCIe or PCIx or AGP), such as some GeForce FX variants, will perform poorly.
MAC OS X Supported Video Cards
NVIDIA GeForce series 7300, 7600 8600, 8800 9400M, 9600M GT GT 120, GT 130
ATI Radeon+G22™ series X1600, X1900 2400, 2600 3870, 4850, 4870
Intel(R) Graphics Media Accelerator (GMA) GMA 3-Series
System Requirement Differences between The Sims 3 and The Sims 2
* Unlike The Sims, The Sims 2, and The Sims Stories, The Sims 3 requires a Service Pack.
* The amount of hard drive space required has raised from 3.5 GB to 6.5 GB.
* The RAM requirement has raised from 256 MB to 1 GB and 512 MB to 1.5 GB.
* The processor requirement has raised from 800 MHz to 2 GHz and 1.3 GHz to 2.4 GHz.
* The amount of video memory required has raised from 32 MB (Free Time and later versions 64 MB) to 128 MB.
* The video card now requires Pixel Shader 2.0 while The Sims 2 and The Sims Stories did not.
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http://sims.wikia.com/wiki/The_Sims_3