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zqueezy

SLI & D3D

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hey folks, I gotta little question: How can I support SLI graphics-cards ind D3D (let's say 9 or 10?) what do I have to initialize... where can I set alternating usage or something. perhaps some links? google didn't turn out to much of help thx zqueezy

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You don't need to do anything. The point of SLI/Crossfire is that the driver handles it all automatically.

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Yes, there are problems with compatibility, but that is more on the graphics card vendor to fix than the developer. From a developer's point of view, the game should need no knowledge of whether or not the system it is running on has SLI.

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Enabling SLI is not "automatic", you have to tell the driver that you want Alternate Frame Rendering or Split Frame Rendering. Otherwise by default you get Compatibility Mode, which only uses one GPU. To specify which mode your app wants you need to use the Nvidia control panel API, which is part of their SDK. Once you've done this the driver will present both GPU's as a single device to your app, so your code doesn't need to do anything special to work with it.

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