http://www.futuremark.com/
Minimum System Recommendations:
-DirectX 9 compatible graphics adapter with support for Pixel Shader 2.0 or later, and graphics memory of 128 MB or above.
-Intel® or AMD® compatible processor running on 2 GHz or above.
-512 MB system memory or more.
-1.5 GB of free hard disk space.
-Windows 2000 or XP operating system with the latest Service Packs and updates installed.
-DirectX 9.0c runtime installed (download) with the latest updates.
-Microsoft Internet Explorer 6 installed, for some 3DMark functionality (download).
-Microsoft Excel 2000, 2003 or XP, for some 3DMark functionality.
-Microsoft DirectX 9 Summer Update 2004 System Development Kit is required to run the image quality test using the reference rasterizer.
There's also the new PCMark05 available now.