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Thread: Strange cross fire problem

  1. #1
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    Strange cross fire problem

    Setup…

    A64 3700+ Diego
    Asus a8rmvp x-fire ready Motherboard
    1x Sapphire X1900XT 512MB Master
    1x Sapphire X1900XTS 512MB Slave
    2GB dual Channel Geil ram pc3200
    Acer AL1951 19” Monitor
    PSU is a Jeantech 700W

    Original parts are below. He purchased the new motherboard because he thought the motherboard was at fault. He also replaced the PSU because he thought it was a power issue.

    MSI rd480 neo2 x-fire ready
    Antec 550w

    The Problem…

    My friend’s crossfire setup seems to be causing him a headache as crossfire does not seem to work over DVI. What happens is the screen flickers between the game and a blank screen, then when you quit the game it comes up “input not supported”

    HOWEVER crossfire works on both my old monitors! A 17” Iiyama 431S prolite and my good old 17” Hitachi.

    SO…

    He went to PC world and purchased the Samsung 20” screen that’s on offer…

    And guess what….

    It does exactly the same as his Acer monitor “it flickers between the game and a blank screen”

    This is a very strange problem, we have also swapped out the slave card with a friend’s and it does exactly the same thing (no other master card to try) BUT surely the master card can’t be to blame as it works on both my old monitors.

    Any ideas??!?


  2. #2
    Anthropomorphic Personification shaithis's Avatar
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    • shaithis's system
      • Motherboard:
      • Asus P8Z77 WS
      • CPU:
      • i7 3770k @ 4.5GHz
      • Memory:
      • 32GB HyperX 1866
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      • Lots!
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      • 2 x Dell 3007
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    Does he have a refreshrate override in Windows or in DXDiag that tries to push the monitor over 60Hz?
    Main PC: Asus Rampage IV Extreme / 3960X@4.5GHz / Antec H1200 Pro / 32GB DDR3-1866 Quad Channel / Sapphire Fury X / Areca 1680 / 850W EVGA SuperNOVA Gold 2 / Corsair 600T / 2x Dell 3007 / 4 x 250GB SSD + 2 x 80GB SSD / 4 x 1TB HDD (RAID 10) / Windows 10 Pro, Yosemite & Ubuntu
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  3. #3
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    input not supported generally means the graphics card is outputting an image that the monitor doesn't support. Any more than that, i don't know...

    Not much use i know, but hey

  4. #4
    Moderator chuckskull's Avatar
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    • chuckskull's system
      • Motherboard:
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      • CPU:
      • 3570k @ 4.7 - H100i
      • Memory:
      • 32GB XMS3 1600mhz
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      • 256GB Samsung 850 Pro + 3TB Seagate
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    Yeah CRT's can handle a wider range of resolutions and refresh than TFT's. So try plugging in the CRT, setting it to the correct res and and refresh rate for the TFT(It'll be in the manual), then swapping back.

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