Part#: 4236MBU Operating System: Windows 7 Professional 64-Bit Optical Drive Type: DVD±R/RW Chipset: Intel QM67 Resolution: 1600 x 900 LCD Features: Anti-glare, LED backlight, 200 nits, 16:9 aspect ratio, 300:1 contrast ratio Memory Speed: DDR3 1333 WLAN: Intel Centrino Advanced-N 6205, 2x2, 11a/b/g/n