X51 R2 exterior
The X51 R2 boasts quite a few connectors. The front has two audio ports and two USB 3.0 ports. Alienware was clever enough to make the alien head logo rotate on its axis, because what would people think if you laid down the chassis horizontally and the logo pointed to the side? The back has four USB 3.0 ports and two USB ports and lots of audio connectors: six analogue, optical and digital coax. The ethernet port is also located in the back.
The rear panel also has an HDMI port you won't use, since the graphics card has two DVI ports, DisplayPort and HDMI.