The minimum system requirements for Photoshop CS6 beta are as follows:

Mac

• Multicore Intel® processor with 64-bit support
• Mac OS X v10.6.8 or v10.7
• 1GB of RAM
• 2GB of available hard-disk space for installation; additional free space required during installation
• 1024×768 (1280×800 recommended) resolution display with 16-bit color and 256MB (512MB recommended, required for Photoshop Extended) of VRAM
• OpenGL 2.0 capable system
• DVD-ROM drive

Windows

• Intel® Pentium® 4 or AMD Athlon® 64 processor
• Microsoft® Windows® XP* with Service Pack 3; or Windows 7 with Service Pack 1
• 1GB of RAM
• 1GB of available hard-disk space for installation; additional free space required during installation
• 1024×768 (1280×800 recommended) resolution display with 16-bit color and 256MB (512MB recommended, required for Photoshop Extended) of VRAM
• OpenGL 2.0 capable system
• DVD-ROM drive

For some reasons Adobe requires online registration and activation for Adobe Photoshop CS6 Beta.