For Windows OS, you need a minimum of a 1GHz processor (2GHz preferred) and 1GB of RAM (2GB preferred).
For MacOS X 10.5.2 and later, you need a minimum of a 64-bit 1GHz processor and 1GB of RAM (2GB preferred).
MacOS X 10.6 and later, you need a minimum of 32-bit 1GHz processor and 1GB of RAM (2GB preferred).
Finally, if you're using Linux, you need a minimum of 1GHz processor and 512MB of RAM(1GB preferred).
The Sumac program takes roughly 17 MB of disk space on the hard drive.