Use this table to determine the level of CPU usage

Selecting Audio and Video Devices for Use with Polycom PVX

		Uses this CPU load
This device...		level...

Logitech QuickCam Orbit MP	Driver version 9.0.2	Medium

Veo Velocity Connect		Medium

V-Stream TV2800 (V-Stream Xpert DVD Maker USB 2.0)		Low

If your device is not listed, you can calculate the CPU load level yourself.

To determine your video input device’s CPU load:

1.With no other applications running, start Polycom PVX. Make sure that there is no call in progress and that you can see video.

2.Right-click an empty area in the Windows Task Bar, and choose Task Manager.

3.Click the Performance tab, and make a note of the CPU Usage, expressed as a percentage of the total CPU.

4.To determine the CPU usage in MHz, multiply the system’s CPU speed by the CPU Usage.

5.Use this table to determine the level of CPU usage:

	CPU Load
CPU Usage	Level	Description

< 200 MHz	Low	The device’s driver load is equivalent to the load
		for devices supported in earlier versions of PVX.
		For example: A webcam that captures 320 x 240
		video or a PCI video capture card.

200 - 600 MHz	Medium	Newer devices that support VGA resolutions and
		higher usually compress the video. The device
		drivers must then decode the video before
		sending it to PVX, which increases the CPU load.
		For example: A webcam that captures 640 x 480
		at 30 fps or a DV input device, such as a digital
		camcorder or webcam that supports Firewire/
		IEEE-1394.

> 600 MHz	High	The device is using CPU-intensive features, such
		as face tracking, video special effects, wide-angle
		lens distortion correction, or audio echo
		cancellation.

For example, suppose your 2.8 GHz computer is running at just over 25% of the CPU with no call in progress. Determine the CPU load level as follows:

2.8 GHz x 25% = 700 MHz of CPU resources in use

Referring to the table, you see that the camera driver’s load is High.