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CoD4 doesn't support TH out of the box.
The demo is also based off of the latest v1.02 patch for the full retail game, so the settings are similar. You can verify it's based off of the latest v1.02 patch by simply looking at the changelog for that patch. You'll see that the changes they mention in that patch are already part of the demo.
The graphics may or may not be sharp in the game depending on your settings. There are two resolution choices called "Interface" and "3D." Interface is basically the resolution of the game's window. Think of this as your typical resolution setting in any game. If you set it to 1920x1200, then the game is going to be running in a 1920x1200 window. The 3D resolution is what the game is actually rendered at before being scaled to your interface resolution. If you set the interface to 1920x1200, but the 3D resolution to 1280x800, then the game is going to be rendered at 1280x800 and upscaled to fit the 1920x1200 interface resolution. This will cause the game to not be sharp, of course. Likewise, you can set the game resolution to be higher than your interface resolution. Setting it higher will cause the game to be much sharper, but also a lot more intensive on the CPU and GPU. Post-processing also adds in depth of field blur, motion blur, and generally will smooth the scene out which may cause the game to also not look as sharp as you want. There are also options for anti-aliasing, which smooths the edges of objects out. This will take away the jagged edges, but also cause the game to look a little more blurry because there are no distinct edges.
Basically, there are a lot of ways you can configure the game to look, and it's up to you how you want it to appear.
Anyway, here are some arguments you can add to your shortcut for the game.
-winxp -- If you use Windows Vista or Windows 7, using this will enable multi-GPU support, but it will disable the use of D3D9Ex.
-nosplash -- Skip the startup splash screen.
-world=empty -- Does not load any world info, which results in a faster startup time for the game. It really only helps you get to the main menu quicker.
-maxmem=2047 -- Allows the game's engine to use more RAM. 2047 is a hardcoded maximum for the game because it's a 32-bit app, and setting it to anything higher than 2047 will cause it to fall back to 2047.
-window -- Starts the game in a window.
-noCB -- Disables multi-core renderering. If you experience visual errors, disabling mulit-core rendering might fix the errors.
-cpuCount=X -- Forces the game to use a specific number of CPUs. People report the setting it to 2 provides the best performance, even on quad-core processors.
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