Dell Alienware M17x R3 (Early 2011) - Manual (Page 109)

CHAPTER 7: SPECIFICATIONS
107
Ports and Connectors
Network adapter
one RJ45 connector
USB two 4-pin USB 2.0 and 3.0 compliant connectors
eSATA/USB combo one 7-pin/4-pin eSATA/USB 2.0-compliant combo
connector with PowerShare
HDMI input and output one 19-pin connector
Mini-DisplayPort one 20‑pin connector
VGA one 15‑hole connector
Audio two stereo headphones/speakers connectors
one microphone‑in connector
S/PDIF one headphone/S/PDIF combo connector
Media Card Reader one 9-in-1 slot