Dell Alienware Aurora R3 (Early 2011) - Manual (Page 53)

Master I/O Board Components
1 processor power connector
(PWR2) 2 processor socket (CPU1)
3 heat-sink fan connector
(VRM_FAN) 4 processor fan connector
(CPU_FAN)
5 memory-module connector
(DIMM1) 6 memory-module connector
(DIMM2)
7 memory-module connector
(DIMM3) 8 memory-module connector
(DIMM4)
9 main power connector (PWR1) 10 front USB connector (FUSB3_0)
11 battery socket (BAT1) 12 serial ATA drive connectors
(SATA1_2)
13 serial ATA drive connectors
(SATA3_4)
14 serial ATA drive connectors
(SATA5_6)
15 front panel connector
(FRONT_PANEL)
16 USB connector (USB1)
17 USB connector (USB2) 18 CMOS jumper (CLEAR_CMOS)
19 Low pin count debug header
(LPC)
20 IEEE 1394 connector (1394)
21 serial port connector (COM1) 22 front audio connector
(FRONT_AUDIO)
23 password jumper (PASSWORD) 24 PCI-Express x1 connector
(SLOT4)
25 PCI-Express x16 connector
(SLOT3)
26 PCI-Express x1 connector
(SLOT2)
27 PCI-Express x16 connector
(SLOT1)
28 eSATA connector (ESATA)
NOTE: The location of the connectors may vary based on the selections you made at the time of purchase.