With a new generation core based on the architecture of the R770 and improved memory management, the R790 based HD 4890 offers higher clock speeds and better performance against the previous generation ATI video cards across the board. However, it falls a bit short of the latest offering from nVidia as well as its flagship single GPU card. So what does this mean for the HD 4890? Well, it does perform well in all the benchmarks but is it really worth the money to upgrade if you currently have an HD 4870? If you are running a poor overclocking stock HD 4870 1GB video card, the Sapphire HD 4890 offers a substantial increase in performance over these cards. Now if you have a card that overclocks well, the difference is not as great and may not be a viable upgrade path. If you are in the market for a new card, it makes sense to get the HD 4890 not just for the stock performance but because the card overclocks very well on the stock cooling.



Link: Overclockersclub