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  1. Alienware X51 R2 – Specs and upgrade options - Hardware Corner

  2. Alienware X51-R2 Review - PCMag

  3. Dell Alienware X51 R2 - Specs, Reviews, Deals - Itechguides

  4. Alienware X51 vs. Alienware X51 R2 - Hardware Corner

  5. Unofficial Alienware community news and discussion - Reddit

  6. How Old is Alienware X51 R2? Exploring the Age of this Powerful …

  7. Alienware X51 R2 | Driver Details | Dell US

  8. Dell retires Alienware’s X51, the desktop that kicked off ... - PCWorld

  9. Alienwares desktop gaming PCs: introducing the X51-R2 and …