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memory interface

Discussion in 'General Hardware' started by binsky3333, Feb 25, 2008.

  1. binsky3333

    binsky3333 New Member

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    Hi,
    Which is better a 512bit bus or a 256bit bus.
  2. hat

    hat Maximum Overclocker

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    Depends on the card in question. A 512 bit 2900XT is generally slower than the 257-bit 8800GTS. But yeah 512bit on identical cards would be faster.
    Crunching for Team TPU
  3. mrhuggles

    mrhuggles

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    256bit to 512bit doubles the bandwidth, so for 256bit to keep up with 512bit it would have to be clocked twice as fast.
  4. Nyte New Member

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    It's dependent on your memory controller as well. A 512-bit memory bus width only gives you the POTENTIAL to get double the bandwidth of a similar card with 256-bit memory bus width.
  5. Kursah

    Kursah

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    Nyte is right, also the GPU's ability to use a 512 bit bus is arguable..even a 320-bit bus is arguable...considering both the 8800gt's and 3870's use 256-bit busses and are faster than their higher-bit-memory-bus fore-graphics-adapters...go for overall performance and needs for your goals, not just memory bus bandwidth, as you may get less than you hoped..even if marginally..some are very picky.

    :toast:
  6. Duekay New Member

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    I heard something about a 256 being faster if it has DDR3 memory rather than a 512 with DDR2.
  7. jbunch07

    jbunch07 New Member

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    memory bus inst everything, depends on ram and clocks, 512 is better than 256 if both cards are identical though

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