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Need some help with picking a 4890!

Discussion in 'AMD / ATI' started by MK4512, Oct 3, 2009.

  1. MK4512

    MK4512 New Member

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  2. erocker

    erocker Super Moderator Staff Member

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    The Sapphire has a better cooler and the memory clocks are the same 975 x 4 = 3900. GDDR5 is quad data rate ram.
     
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  3. MK4512

    MK4512 New Member

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    Okay thanks alot!
     
  4. InTeL-iNsIdE Guest

    they both have the same memory speed, the 3900mhz is 975 quad pumped which is how ddr works. as for which of the 2 is better, I couldnt say, have a look at the reviews on the egg and see what people are saying about them both, if you are interested in overclocking then see which clocks the best on a regular basis :toast:
     
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  5. largon

    largon

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    Not.
    GDDR5 is DDR, double data rate. The difference to earlier GDDR generations is GDDR5 runs internally at three different frequencies:
    Memory cell / command clock, address clock and data clock. Memory cells and command clock runs at half speed of the nominal clock (975MHz/2=487,5MHz), address clock at nominal (975MHz) and data clock at twice the nominal (1950MHz), but as GDDR5 is DDR, double data rate, that 1950MHz data clock has a throughput equivalent of a 3900MHz SDR clock (2×1950MHz).
     
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