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Alienware X51 R2 vs. Alienware Aurora R13 Comparison
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Alienware X51 R2 - DT - Core i7 4770 / 3.4 GHz - RAM 8 GB - HDD 1 TB - DVD-Writer / Blu-ray - GF GTX 660 - GigE - WLAN:
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▻ Alienware X51: How to upgrade your PC RAM (Gaming PC Tutorial/ Guide) - YouTube
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Alienware X51 R1/R2/R3 RAM Replacement - iFixit Repair Guide
