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.

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

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Update information

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

Windows Vista, 32-bit versions

Download the 936710 package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=94D790BF-1E15-46D7-923A-614E47F016C8)

Windows Vista, 64-bit versions

Download the 936710 package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=6FFFE373-525C-4F1D-B07B-CC53F750764F)

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base: 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, 32-bit versions

File name	File version	File size	Date	Time	Platform
D3d10.dll	6.0.6000.20609	1,029,120	31-May-2007	02:40	x86
D3d10core.dll	6.0.6000.20609	187,392	31-May-2007	02:40	x86
Update.mum	Not Applicable	2,458	31-May-2007	10:46	Not Applicable
X86_c30b40dd95da1981e8329107227239f7_31bf3856ad364e35_6.0.6000.20609_none_40e3797decb919c7.manifest	Not Applicable	700	31-May-2007	10:46	Not Applicable
X86_dd1f28178fbe0d361bf2b5ecf100d67b_31bf3856ad364e35_6.0.6000.20609_none_7d63161e9324756f.manifest	Not Applicable	706	31-May-2007	10:46	Not Applicable
X86_microsoft-windows-directx-direct3d10_31bf3856ad364e35_6.0.6000.20609_none_ee64c477e99af382.manifest	Not Applicable	6,092	31-May-2007	10:49	Not Applicable
X86_microsoft-windows-directx-dxgi_31bf3856ad364e35_6.0.6000.20609_none_392ad72c3a7baf89.manifest	Not Applicable	5,751	31-May-2007	10:49	Not Applicable
Dxgi.dll	6.0.6000.20609	167,936	31-May-2007	02:40	x86

Windows Vista, 64-bit versions

File name	File version	File size	Date	Time	Platform
Amd64_077f65cee3272d8f4a0c7eb0d43d5977_31bf3856ad364e35_6.0.6000.20609_none_c826ecea2fa8c5e1.manifest	Not Applicable	1,060	31-May-2007	10:47	Not Applicable
Amd64_22d4d840db7ac6a72374f8699c9c202b_31bf3856ad364e35_6.0.6000.20609_none_0227f0b100e98e84.manifest	Not Applicable	1,048	31-May-2007	10:47	Not Applicable
Amd64_microsoft-windows-directx-direct3d10_31bf3856ad364e35_6.0.6000.20609_none_4a835ffba1f864b8.manifest	Not Applicable	6,108	31-May-2007	10:54	Not Applicable
Amd64_microsoft-windows-directx-dxgi_31bf3856ad364e35_6.0.6000.20609_none_954972aff2d920bf.manifest	Not Applicable	5,771	31-May-2007	10:54	Not Applicable
D3d10.dll	6.0.6000.20609	1,268,224	31-May-2007	03:54	x64
D3d10core.dll	6.0.6000.20609	283,648	31-May-2007	03:54	x64
Update.mum	Not Applicable	2,458	31-May-2007	10:46	Not Applicable
Dxgi.dll	6.0.6000.20609	240,640	31-May-2007	03:54	x64

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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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

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