OS: Windows® XP SP3, Windows® Vista SP1 and Windows® 7 Processor: AMD Athlon™ 64 X2 3800+ / Intel® Pentium 4 630 Memory: 1024MB (Windows® XP), 2048MB (Windows® Vista or 7) Graphics: Nvidia GeForce 8800 GT / ATI Radeon HD 2600XT DirectX®: 9.0c Hard Drive: 2GB Sound: Any DirectX Compatible DirectX®: 9.0c *I Am Alive is not designed to be compatible with Crossfire and SLI setups. Be advised that if you encounter performance issues with I am Alive, try temporarily disabling SLI/Crossfire as part of your troubleshooting.