If our review of the Sapphire RX 470 Nitro whetted your appetite then the RX 480 Nitro OC+, with a big factory overclock, might be just the card you want.
http://www.overclock3d.net/reviews/gpu_displays/sapphire_rx_480_nitro_oc_review/1
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Sapphire RX480 Nitro+ OC Review
