Alienware X51 AX51R2-9311BK Gaming Desktop (Discontinued by Manufacturer) Intel Core i7-4790 3.60 GHz Quad-core Processor (8MB Cache, up to 4.0GHz) 8 GB Dual Channel DDR3 1600Mhz - 1 TB 7200 rpm HDD - Slot-Loading Dual Layer Blu-ray Reader Windows 8.1 64-bit (English) AMD Radeon R9 270 Graphics with 2GB GDDR5 Gigabit Ethernet - Wi-Fi 802.11ac - High-Definition 7.1 Performance Audio with Waves MaxxAudio