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Sapphire R9 270X Dual-X Review - YouTube
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Sapphire TOXIC R9 270X OC Specs | TechPowerUp GPU Database
AMD Radeon R9 review: 270X & 280 | Expert Reviews
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PowerColor PCS+ R9 270X Specs | TechPowerUp GPU Database
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SAPPHIRE Radeon R9 270X 2GB GDDR5 | eBay
