Dell Alienware Area-51 ALX (Late 2009) - Manual (Page 66)

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CHAPTER 8: BASIC SPECIFICATIONS
Top Panel Connectors
IEEE 1394
one 6-pin serial connector
USB three 4-pin USB 2.0-compliant connectors
Audio stereo headphone and microphone connectors
eSATA one 4-pin eSATA connector
Communications
Network adapter
10/100/1000 Mbps Ethernet LAN on system
board
Wireless (optional) WiFi/Bluetooth wireless technology
Drives
Externally accessible
three 5.25-inch drive bays for Blu-ray Disc ™
combo, Blu-ray Disc writer, DVD+/-RW, or DVD
combo
one 3.5-inch drive bay for media card reader
Internally accessible six 3.5-inch drive bays for SATA-II hard drives
Expansion Bus
PCI:
Connector
one
Connector size 124-pin connector
PCI Express x1:
Connectors two
Connector size 36-pin connectors
PCI Express x16:
Connectors two
Connector size 164 pins connectors
Lanes 16
PCI Express x16:
Connector
one
Connector size 164 pins connector
Lanes 4