Acer Aspire 7551-7422 17.3" Quad Core 2.2GHz 4GB 500GB AMD Phenom II X4 Quad-Core N970 processor 2.2GHz, 2MB L2 Cache 4GB DDR3 SDRAM system memory (expandable to 8GB) 500GB SATA hard drive 8x SuperMulti DVD Double-Layer Drive 17.3" HD+ widescreen CineCrystal display