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8600GT (far) slower then 6800GT and 7600GT?

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  • 8600GT (far) slower then 6800GT and 7600GT?

    Hello all,

    My main workstation (Dual Opteorn, 6800GT) died (or actually, got flooded to death) and is being temporarily replaced by an Athlon64X2/5000 combined with a 8600GT/512MB.

    However, I'm getting semi-abysmal performance out of my 8600GT. (Even when I OC it to 450Mhz/600Mhz. (Up from 400Mhz/575Mhz).
    While I could play UT2K4 at 1920x1200x4XFSAA on my aging 6800GT, UT2K4 is only playable at 1920x1200xNO FSAA on my 8600GT.
    Same goes for Q4 and ETQW.

    Far worse, I get much better performance out of my 70$ 7600GT/AGP that runs on my aging Sempron64/2800 machine.

    Can anyone confirm these findings?

    Michael,
    Have you ever benchmarked the 7600GT vs. the 8600GT using the 1xx drivers?

    - Gilboa
    DEV: Intel S2600C0, 2xE52658V2, 32GB, 4x2TB + 2x3TB, GTX780, F21/x86_64, Dell U2711.
    SRV: Intel S5520SC, 2xX5680, 36GB, 4x2TB, GTX550, F21/x86_64, Dell U2412..
    BACK: Tyan Tempest i5400XT, 2xE5335, 8GB, 3x1.5TB, 9800GTX, F21/x86-64.
    LAP: ASUS N56VJ, i7-3630QM, 16GB, 1TB, 635M, F21/x86_64.

  • #2
    You use extra high res. Also FSAA needed extra ram. A 6800 GT has a 256 bit memory bus and a 7600 GT has 128 bit (same for 8600 GT). So you would need at least a 100% higher memory clock to have got the same memory bandwith. You definitely use the wrong card for that res.

    Comment


    • #3
      Originally posted by Kano View Post
      You use extra high res. Also FSAA needed extra ram. A 6800 GT has a 256 bit memory bus and a 7600 GT has 128 bit (same for 8600 GT). So you would need at least a 100% higher memory clock to have got the same memory bandwith. You definitely use the wrong card for that res.
      Sounds reasonable enough. (This card is just a stop-gate until I buy a new machine with a 8800XX on it.)
      However, why am I getting (far) better performance out of the 7600GT? I know that the 8600GT didn't outperform the 7600GT... but I'm seeing ~20% drop in performance.

      Am I the only one?

      - Gilboa
      DEV: Intel S2600C0, 2xE52658V2, 32GB, 4x2TB + 2x3TB, GTX780, F21/x86_64, Dell U2711.
      SRV: Intel S5520SC, 2xX5680, 36GB, 4x2TB, GTX550, F21/x86_64, Dell U2412..
      BACK: Tyan Tempest i5400XT, 2xE5335, 8GB, 3x1.5TB, 9800GTX, F21/x86-64.
      LAP: ASUS N56VJ, i7-3630QM, 16GB, 1TB, 635M, F21/x86_64.

      Comment


      • #4
        Do you use 169.x or 100.x driver series?

        Comment


        • #5
          Tried them both.

          - Gilboa
          DEV: Intel S2600C0, 2xE52658V2, 32GB, 4x2TB + 2x3TB, GTX780, F21/x86_64, Dell U2711.
          SRV: Intel S5520SC, 2xX5680, 36GB, 4x2TB, GTX550, F21/x86_64, Dell U2412..
          BACK: Tyan Tempest i5400XT, 2xE5335, 8GB, 3x1.5TB, 9800GTX, F21/x86-64.
          LAP: ASUS N56VJ, i7-3630QM, 16GB, 1TB, 635M, F21/x86_64.

          Comment

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