For Dell Alienware X51 Motherboard Ms-7796 Maintherboard 100% Tested Fully Work - Laptop Motherboard - AliExpress
Support for Alienware X51 R2 | Documentation | Dell US
User manual Alienware Area 51-R2 (English - 133 pages)
Specs Alienware x51 R2 i5-4440 Desktop Intel® Core™ i5 16 GB DDR3-SDRAM 1000 GB HDD Windows 7 Home Premium Mini PC Black PCs/Workstations (ALWX51D-2628)