DirectX and Shader Model Requirements for Games on Steam
Pixel Shading is a method used for rendering advanced graphical features such as bump mapping and shadows. Most modern PC games utilize pixel shaders in conjunction with advanced GPUs (Graphics Processing Units) found on most Nvidia, ATI and certain Intel video cards. Pixel Shaders also directly correspond with Microsoft's DirectX platform.
It is extremely important to check each game's system requirements before deciding on making a purchase. If you are not sure what Pixel Shader level your video card can support, there is a chance that your video card will not be capable of running a game that requires an advanced Pixel Shader model - even if your card meets the minimum DirectX requirements.
General Guideline - DirectX Levels and Pixel Shader Versions:
Please follow our DirectX Guide to determine what version of DirectX you currently have installed and how to update DirectX.
Please note that the version of DirectX that your video card supports can be misleading. You may be able to install the latest version of DirectX on your system, however there is distinct level of hardware DirectX support that must also be met in order for your video card to utilize Pixel Shader functions. Even with DirectX 9.0c installed, your video card may only be capable of supporting DirectX 7 due to the hardware limitation.
Below you will find detailed tables of video cards and what level of both DirectX and Pixel Shader Model are supported. Please use these tables to locate the video card you are using and then check the DirectX level of hardware support to compare with the system requirements of the games available on Steam. The DirectX level is listed on the right-hand side of the charts.
|Nvidia||Comparison of NVIDIA Graphics Processing Units|
|ATI||Comparison of ATI Graphics Processing Units|
Certain Intel video cards such as the Intel 945GM have a limitation in design that may result in issues when trying to run Source Engine games. The 3D graphics core does not support hardware transform and lighting and the similar vertex shader technologies, which is an important part of the 3D acceleration pipeline. Instead, this functionality is emulated in software which may reduce compatibility and performance with 3D games.
If you are experiencing crashing or slow performance with your Intel card and The Orange Box games (Half-Life 2: Episode Two, Portal and Team Fortress 2), then please try running the game and then typing this command in the console:
If that improves stability then please add it to your config file. Your config file is located in the SteamApps folder, under your Steam account name and then the folder for the game you would like to play. For example:
C:\Program Files\Steam\steamapps\< Account Name >\team fortress 2\tf\cfg
Intel is working on improving driver support for their video cards. Please always make sure you are running the latest drivers for the best experience.
For more information, check the Intel Video Cards with Portal, Team Fortress 2 and Half Life 2: Episode 2 topic.