Located on the right side of the CPU socket (vertical orientation). Power Board Connector
Refer to the diagram's bottom-right quadrant. The two DIMM slots are not color-coded. For dual-channel mode: alienware x51 r2 motherboard diagram
Back Panel Ports. Network adapter One RJ45 connector. USB Two USB 2.0 ports. Four USB 3.0 ports. Alienware X51 R2 Specifications - Dell Located on the right side of the CPU
Always download the official "Alienware X51 R2 Service Manual" (PDF). However, for quick reference, the visual diagram below summarizes the key components. for quick reference