Review of the Sapphire R9 290X Vapor-X OC 4GB Video Card. The Sapphire R9 290X Vapor-X OC is one of the most recent AMD Radeon R9 290X video cards to come to market. The Radeon R9 290X became the flagship single-GPU card for AMD nearly 8 months ago released in October 2013 and it has been a popular card for both gamers and Litecoin miners. While the Sapphire R9 290X Vapor-X OC was arguably late to market, it might very well be one of the best Radeon R9 290X video cards due to the custom Vapor-X/Tri-X GPU cooler, 10-phase power design and one of the highest factory overclocks that we have seen on any Radeon R9 290X 4GB graphics cards.
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