HP Pavilion Elite M9550F Desktop PC (Discontinued by Manufacturer) 2.5 GHz Intel Core 2 Quad Q9300 Processor 8 GB RAM (max) 1 TB hard drive Windows Vista Home Premium with SP1 (64-bit version), ability for Blu-ray Disc playback and DVD-RW/CD burning ATI Radeon HD 4850 graphics card (512MB)