If you haven't read Part 1 of our Half Life 2 GPU Roundup, click here to read it before continuing on with this article.

The golden rule of Half Life 2 is this – regardless of what sort of graphics card you have (within reason), the game will run well, but at varying levels of image quality.  Here’s an example: in our at_canals_08 benchmark at 1280 x 1024, the ATI Radeon 9700 Pro averages 54.2 frames per second.  A GeForce4 MX440, averages 45.6 frames per second - pretty close considering the 9700 Pro was one of ATI's most powerful GPUs and sold for $400, and the GeForce4 MX is basically a GeForce2 MX.  Now both of these cards were run at their maximum detail settings, but here’s where the two cards differ: the best image quality settings the GeForce4 MX can achieve are significantly lower than what the Radeon 9700 Pro can achieve.  It is this type of situation that lays the foundation for our comparison here today.

When it comes to developing games, the biggest thing publishers look for are minimum system requirements.  The lower the minimum system requirements, the more games publishers can sell.  But the problem with really low minimum system requirements is that you end up with a game that doesn’t look too great on higher end hardware.  Valve has spent a great deal of time ensuring that multiple rendering paths were included with Half Life 2 to not only offer great performance on low end graphics cards, but also to offer spectacular image quality on high end GPUs.  The three codepaths that we will be looking at today are Valve’s DirectX 7, DirectX 8/8.1 and DirectX 9 paths in Half Life 2.

All of the GPUs we compared in Part 1 of our Half Life 2 performance guides not only default to the DirectX 9 codepath, but also perform very well under it.  We will show a comparison between the DX9 and DX8 codepaths shortly but rest assured that if you can run Half Life 2 in DX9 mode then you definitely should as it offers the best image quality you can get.

Half Life 2 performs a system-wide autodetect that will automatically select the best rendering path and image quality settings for your hardware. You can find out which rendering path you are using by looking at the video options control panel within Half Life 2:

The Hardware DirectX level field indicates what rendering path you are currently using. You can specify alternate rendering paths by using the following commandline switch: -dxlevel xx, where xx is 90 for DirectX 9, 81 for DirectX 8.1, 80 for DirectX 8.0 and 70 for DirectX 7.0. You can specify whatever DX level you'd like, but if your hardware doesn't support it you won't get any of the benefits of it. For our tests here today we used the DX9, DX8 and DX7 rendering paths. When possible we used the DX8.1 rendering path.

The point of this article is to compare both the image quality and the performance of the more mainstream DirectX 8 and DirectX 9 GPUs, and what better way to start than by looking at the difference in image quality between the DX8 and DX9 codepaths...

DirectX 9 vs. DirectX 8: Image Quality


View All Comments

  • klah - Saturday, November 20, 2004 - link

    "cant wait for CPU benches"

    Check out these:

  • KevinCQU - Saturday, November 20, 2004 - link

    #17, I'm running the game on a regular GF3, AXP2500+ @2.2 and 512 ram. It runs smoothly at directx8 settings, I turned down the water quality though, havent tried turning it up yet, been busy playing the game ;) I'm impressed though....its definitely playable at 1024 and it looks pretty nice too
  • ksherman - Friday, November 19, 2004 - link

    #17, im probably gonna try and run the game (GF2 TI200, but OCed to Ti400 speeds ;), so ill let you know if itll work... Reply
  • ksherman - Friday, November 19, 2004 - link

    dumbish question--> i i wanna play in DX7 or 8 mode, do i need to install different driers, or do i just use the ingmae settings? I dont actually own the game yet, so thats why i ask... Reply
  • kmmatney - Friday, November 19, 2004 - link

    I can't believe how much better DirectX looks compared to OpenGL. Seems like Id made the wrong choice... Reply
  • GonzoDaGr8 - Friday, November 19, 2004 - link

    Aaargh..Has anyone ran this game yet on a Geforce3(regular/Ti200/Ti500) based card yet? I'm curious as I have a Ti200 and could run this is DX8 mode.. Reply
  • skiboysteve - Friday, November 19, 2004 - link

    #13 is exactly right

    its not all OpenGL vs DX or nvidia optimization to ati optimization.

    look back at anands article about the graphics pipeline on each of these cards. Doom3 was extremly texture intensive, doing allot of lookup to tables instead of doing the math.

    nv30 and nv40 are very good at doing texture look ups, and only the nv40 is good at the math. nv30 had a very non math friendly pipeline.

    the r300-r400 were better at math.

    its all in the articles on this very website.
  • bupkus - Friday, November 19, 2004 - link

    I have a Ti4200 w/ 64MB ram and I changed from 1024x768 to 800x600 to fix some occasional stutter problems; it didn't help.
    Which res should I probably be able to run in. I have a 2500+ Barton OC'd to 2.2GHz with 2x256 OCZ PC3500 EL.
    Just for fun, I went to 1280x1024 for my LCD just to see how it would look (without movement) and it was very nice.
  • skunkbuster - Friday, November 19, 2004 - link

    also, nvidia is known to be better at openGl games and weaker in games that use dx.

    the same as ati is known to be better at dx games, and weaker in openGl games.

    doom3= open gl
  • Falloutboy - Friday, November 19, 2004 - link

    #10 its because Doom 3 was very texture intensive based, which the 5xxx series of nvidia exceled at and HL2 is a very shader intensive engine wit hless emphasis on texutures, and as we all know by now the 5xxx series sucked in DX9 shaders Reply

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