Lenovo Ideacentre B305 Series 40313BU Desktop (Black) AMD Athlon II X2 235e Dual Core 4 GB PC3-10600, 1333 MHz DDR3, non parity, dual channel capable, two 204 pin SO DIMM sockets, (4GB max) 1 TB, 7200 RPM, DVDRW 21.5" Full HD (WUXGA 1920x1080) TFT color, VibrantView (glossy), LED backlight, Multi-touch, 250 nits, 16:9 aspect ratio, 1000:1 contrast ratio, ATI Radeon 3000 HD integrated graphics Windows 7 Home Premium 64 Bit