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8GB Memory Dell Alienware X51 R3 DDR4 RAM Upgrade
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Alienware X51 R2 – Specs and upgrade options
Alienware x51 Graphics Card Upgrade/Install - YouTube
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X51 R2 CPU Cooler Upgrade and GTX 970 Success - Dell Community
CMS 16GB (2X8GB) DDR3 12800 1600MHz Non ECC DIMM Memory Ram Upgrade Compatible with Alienware® X51 R2 Desktop - A63 at Amazon.com
Alienware X51 RAM Upgrade How-to - YouTube
