Windows 8 and 8.1 Forums


DX9.0c - win7 vs win8.1 :-(

  1. #1


    Denmark
    Posts : 224
    Windows 8.1 64bit Pro

    DX9.0c - win7 vs win8.1 :-(


    Greetings.
    I'm using a game "Eurotrucksimulator 2" and it is made with DirectX 9.0c. With same hardware (same PC), I have 15-20% lower performance in this game with Windows 8.1 than I had with Windows 7 . It is a MSI GTX 770 Lightning graphic card, and I'm using same driverversion in both Win7 and win8.1.

    In DirectX 11 games (like Farcry 3 and Crysis 3), Windows 8.1 is as good as Windows 7.

    Why is Win8.1 slower in dx9.0c?
    Can I do anything about it? (reinstall win7 is not my favorit)

      My System SpecsSystem Spec

  2. #2


    Posts : 94
    Microsoft Windows 8.1 Pro 64-bit


    Did you install DX 9.0C June 2010 release to your windows 8 installation?
      My System SpecsSystem Spec

  3. #3


    Denmark
    Posts : 224
    Windows 8.1 64bit Pro


    Yes. I have tried that, but it did not make any difference.
      My System SpecsSystem Spec

  4. #4


    Posts : 25
    Windows98 to Windows7


    I have referred to a similar issue in an different thread.
    This is a pretty common problem, but I have yet to find the solution of the low FPS. Infact, I am finding speeds of like 15% to 20% of full speed vs a loss of 15 to 20%...

    There is something different in the windows8 settings, and I really hope someone finds the magic bullet.
      My System SpecsSystem Spec

  5. #5
      My System SpecsSystem Spec

  6. #6


    Denmark
    Posts : 224
    Windows 8.1 64bit Pro


    #5 Yes I am running latest version.

    There seems to be a real performance-hit in Win8 when using a dx9.0c game compared to same game, same HW in Windows 7.
    I don't know where to look, as sometimes (but not allways) neither CPU or GPU is at 100% when the game takes a slow-down. This NEVER happens in Windows 7, so clearly something in Windows 8 is not optimized as long as it is dx9.0c!
      My System SpecsSystem Spec

DX9.0c - win7 vs win8.1 :-(
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