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Monitor Attributes Tab
The Attributes tab provides display data channel (DDC) information.
DDC is the technology whereby the monitor communicates to the graphics card all the resolutions and refresh rates it supports. The RADEON™ family of graphics cards are all DDC compliant.
By unchecking Use DDC information, you can manually select the maximum resolution and refresh rate of your monitor. However, this is only recommended for older or non DDC compliant monitors.