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The last few months has seen an absolute barrage of different HD4890 SKUs. A lot of this has to do with the absolute insane amount of overclocking headroom evident in the RV790 design. This headroom, which scales very well with extra power, allows for many different models to fill in the gaps. A look at Sapphire's website shows an amazing seven different models for the 4890 alone! Today, we look at one of these models, the HD4890 Vapor-X 2GB edition. What makes this particular model different, however, is not the clock speed of the core; as there are several Sapphire models that have a higher clock. The real differentiation between this card and the other cards is the simple fact that it is equipped with 2GB of GDDR5, compared to the normal 1GB amount. In fact, the Sapphire Vapor-X is the only HD4890 on the market that has been equipped with 2GB of memory. Of course, whenever we see an advancement in memory size, we must ask if it is truly beneficial.
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