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I am not really sure but I installed mine in a Dell XPS 8700 and it works great. Knowing that Dell owns Alienware I would say that it probably would be compatible. You would have to check with Dell, look it up on you tube, or Cnet for the answer. Hope that helps.
Sorry, there was a problem. Please try again later.Yes, the graphics card will fit an Alienware X51 R1 and it is compatible with the system.
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