Dell Unveils Alienware X51 | Windows Experience Blog
Old & New (Bring Alienware X51 R2 back to life) by meng8123 - Intel Core i7-4770, GeForce GTX 970, EVGA Hadron Mini ITX Tower w/500 W Power Supply - PCPartPicker
Dell Alienware X51 Desktop, Intel Core i7-4790, 8 GB memory, 2 TB Hard Drive*FREE UPGRADE TO WINDOWS 10 - Sam's Club
Solved: Upgrading an Alienware X51 R2 Video Card - Dell Community