CybertronPC Strike-GTX Gaming PC (Black) (Discontinued by Manufacturer) System: Intel Core i5-3570K 3.40GHz Unlocked Quad-Core | Intel Z68 Express Chipset | 16GB DDR3 | 1TB HDD | Genuine Windows 7 64-bit Graphics: 2x NVIDIA GeForce GTX550 Ti 1GB Cards in SLI | 24X DVDRW Dual-Layer Drive | Audio: 7.1 Channel | Gigabit LAN | Keyboard & Mouse Expansion Bays/Slots Total(Free): 3(1) Ext. 5.25"|6(5) Int. 3.5/2.5" | 2(2) PCI Exp. x1|2(0) PCI Exp. x16|4(0) DIMM 240P Connectivity: 2x USB 3.0 | 7x USB 2.0 | 1x RJ-45 Network Ethernet 10/100/1000 | Audio | 4x DVI | 2x Mini-HDMI Chassis: Aerocool Strike-X GT Mid-Tower w/80PLUS Bronze Certified 800 Watt Power Supply | 1 Year Parts & Labor Warranty | Free Lifetime Tech Support