Asus X551MA-DS21Q 15.6-Inch Intel Baytrial Pentium N3520 Quad Core 2.17GHZ/4GB/500 GB/Windows 8.1 Notebook Intel BAYTRIAL-PENTIUM N3520 2.17 GHz 4 GB DDR3 500 GB 5400 rpm Hard Drive 15.6-Inch Screen Windows 8.1