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Amazon.com: Valley Of The Sun Original 2GB Graphics Video Card GPU Replacement, for Dell Alienware Gaming Laptop M15X M17X R2 R4 R5 M18X R1 R2, NVIDIA GeForce GTX 860M GDDR5, MXM VGA
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Nvidia Geforce GTX 860m 4GB or GTX 960m 2GB, what is the difference in performance, does the 2Gb of extra RAM make the older model better? - Quora
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