SYMPTOMS
Consider the following scenario:

• You have a Windows Vista-based computer.
• The computer uses two or more DirectX-compatible graphics processing units (GPUs) in a linked configuration.
• You are using a DirectX 10 application and driver.

In this scenario, the computer's graphics performance indicates that only a single GPU is being used.


CAUSE
This problem occurs because the operating system does not forward driver-render requests to the secondary GPU.