Quantum Leap Pianos PC RECOMMENDED SYSTEM: Intel Core 2 Quad or AMD Quad-Core 2.66GHz or higher8GB RAM or more64-bit Windows/Host Sequencer7200 RPM or faster (non energy saving) hard drive for sample streaming, iLok Security Key (not supplied) 263 GB Free Hard Disc Space, Each piano can be loaded and used individually. 4GB RAM is required to use the 'Full' Programs, DVD Drive MAC RECOMMENDED SYSTEM: Mac Pro Quad-Core Intel Xeon 2.66GHz or higher, 8GB RAM or more7200 RPM or faster (non energy saving) hard drive for sample streaming iLok Security Key (not supplied)