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ITsVISTA KB-Link: KB953228

The CPU usage of a high-speed USB 2.0 audio device that is connected to a computer that is running Windows Server 2008 or Windows Vista is greater than the CPU usage of the same device when the device is connected to a Windows XP-based computer

You connect a high-speed USB 2.0 audio device to a computer that is running Windows Server 2008 or Windows Vista. When you operate the USB audio device, you notice that the CPU usage is greater than the CPU usage of the same device when the device is connected to a Windows XP-based computer. You also notice that the CPU usage is greater than the CPU usage of a similar USB audio device that connects as a full-speed USB device. Additionally, you may experience skipping in audio playback from the high-speed USB 2.0 audio device.

Note: The increase in the CPU usage may be especially high in a low-performance system.

There is a download that resolves this issue. See Hotfixes for details.
32-bit Download: Contact Microsoft
64-Bit Download: Contact Microsoft

For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB953228.

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