Microsoft KB Archive/936710

= When a DirectX 10 application runs on a Windows Vista-based computer that has multiple graphics cards, the computer does not use the secondary graphics card =

Article ID: 936710

Article Last Modified on 8/28/2007

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APPLIES TO


 * Windows Vista Home Basic 64-bit Edition
 * Windows Vista Home Premium 64-bit Edition
 * Windows Vista Business 64-bit Edition
 * Windows Vista Enterprise 64-bit Edition
 * Windows Vista Ultimate 64-bit Edition
 * Windows Vista Starter
 * Windows Vista Home Basic
 * Windows Vista Home Premium
 * Windows Vista Business
 * Windows Vista Enterprise
 * Windows Vista Ultimate

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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.



Update information
The following files are available for download from the Microsoft Download Center:

Windows Vista, 32-bit versions
Download the 936710 package now.

Windows Vista, 64-bit versions
Download the 936710 package now.

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to obtain Microsoft support files from online services

Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

Prerequisites
No prerequisites are required.

Restart requirement
You must restart the computer after you apply this update.

Update replacement information
This update does not replace a previously released update.

File information
The English version of this update has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Windows Vista, 64-bit versions


STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
For more information, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional query words: SLI Scalable Link Interface CrossFire DirectX10 D3D10

Keywords: kbbug kbfix kbqfe kbprb atdownload kbexpertiseinter kbhotfixserver kbwinvistapostrtmfix KB936710

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