Since 2007, when Sapphire released the HD3870 Atomic that was reviewed here on OCC, the company has used the Vapor change cooling concept to cool just about all of its upper end enthusiast grade video cards. The one exception that comes to mind is the HD4870x2 Atomic that was water cooled. By using this cooling solution and using better parts, Sapphire's top end cards have that extra little bit in the tank when it comes to cooling and overclocking potential when compared to the reference cards.The Sapphire HD4890 Vapor-X 2GB model is basically the 1GB model with an additional 1GB of GDDR5 memory to try and help out on the top end resolutions. The clock speeds remain identical at 870MHz on the 55nm RV790 core and 1050MHz on the not one but two gigabytes of GDDR5 memory. If the 2GB uses the same Quimonda memory that is rated for 1000MHz, I would expect the overall performance and overclocking to be very similar. Will the extra memory memory on the HD4890 Vapor-X 2GB make a difference in performance or will it just be an added bonus to help with a bit of future proofing? Will it be harder to overclock with the extra memory? Questions that definitley need answering as I have seen more than one post in forums asking just that question. Let's find out!
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