Alienware X51 Processor Installation Guide/ How To Upgrade Alienware X51 CPU Demonstration - YouTube
X51 R2 CPU Cooler Upgrade and GTX 970 Success - Dell Community
Build, Heat, and Power Consumption - Alienware X51: The Xbox With Teeth
Best Buy: Alienware X51 R2 Desktop Intel Core i5 8GB Memory 1TB Hard Drive Black AX51R25744BK
What Should I Upgrade On My PC Alienware x51 R2 Transferred Build - YouTube
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
X51 R2 CPU Cooler Upgrade and GTX 970 Success - Dell Community
Alienware X51 R2 Desktop Gaming System Review - Page 3 of 8 - Legit Reviews