For now, the HD 4890 is ATI's best video card besides the dual-chip HD 4870 x2. With an overclocked out of the box clock speed of 870MHz and a memory clock speed of 1050MHz, the Sapphire Vapor-X video card is faster than the default clocked HD 4890s on the market. This card is available on Newegg for $249.99 making it a $30 premium over the 1GB version of the same card. 2GB only really makes a difference when high resolution AA+AF is enabled. Also be aware of the system requirements are slightly wrong on their website.
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