Amazon.com: KM92T, Fit for DELL Alienware X51 R1 System Motherboard 17 * 17 cm DDR3 H61 Lga 1155 Motherboard Original Desktop Mini Itx 0KM92T KM92 : Electronics
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Refurbished: Dell Alienware X51 R1 Gaming Desktop ( Intel Core i7-2600 3.4Ghz, 8GB Ram, 1TB Hard Drive, Nvidia GeForce GTX 555 1GB, Windows 10 Home ) Grade B Desktop Computers - Newegg.com
Amazon.com: KM92T, Fit for DELL Alienware X51 R1 System Motherboard 17 * 17 cm DDR3 H61 Lga 1155 Motherboard Original Desktop Mini Itx 0KM92T KM92 : Electronics
Amazon.com: KM92T, Fit for DELL Alienware X51 R1 System Motherboard 17 * 17 cm DDR3 H61 Lga 1155 Motherboard Original Desktop Mini Itx 0KM92T KM92 : Electronics
Upgrading The Alienware X51 R1 To Game in 2020 -Massive Gains! - YouTube
Alienware X51 – Specs and upgrade options
Best Buy: Alienware X51 R2 Desktop Intel Core i7 8GB Memory 1TB Hard Drive Black AX51R25743BK