Apple 21.5" iMac Intel Core 2 Duo 3.06GHz, 4GB RAM, 500GB Hard Drive, NVIDIA GeForce 9400M, SuperDrive Processor: Intel Core 2 Duo 3.06 GHz RAM: 4 GB DDR3 SDRAM Hard Drive: 500 GB SATA (Serial ATA) Graphics: NVIDIA GeForce 9400M graphics processor with 256MB of DDR3 SDRAM Operating System: Mac OS X v10.6 Snow Leopard