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Why different performance?

I thought radeon hd 6770 1gb ddr5 means radeon hd 6770 1gb ddr5 graphics card. but click on the link given by me. why the performances is different of different models of 6770 graphics card?
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  1. Best answer
    well there are a few different reasons for this
    1) the difference is small and it is the margin of error
    2) different comp0anies make different boards that allow for different clock rates (usually higher) which affect performance
    3) The test system might not have been the same and was affecting performance
  2. mindless728 said:
    well there are a few different reasons for this
    1) the difference is small and it is the margin of error
    2) different comp0anies make different boards that allow for different clock rates (usually higher) which affect performance
    3) The test system might not have been the same and was affecting performance

    so how will i understand which one is better?
  3. Using utilities like MSI Afterburner - you can most time increase the clocks yourself - same performance then.
    -Bruce
  4. what are the 2 cards you're referring to? do you have links to each of them?
  5. Usually the difference is so small that it's not a major factor in making your decision. They usually all have different cooling systems and amount of video RAM, and some will apply a small overclock for you, however you can also do this yourself (but it's technically not covered by their warranty).

    Internally, they all use the same graphics chip made by AMD, they won't have drastically different performance. They simply slap the chip on a board, supply clock signals to it, and put whatever memory, cooling, and connectors they want to use on it.

    You can look at the clock rates of the same card, the ones with higher clocks will be slightly faster (50MHz on a 900Mhz card is about 6% better).
    Usually though, things like the warranty, brand preference, and connections become more important than the minor differences in performance.
  6. Best answer selected by BSNL.
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