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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 38,487
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Mac Specs: 27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, 3 iPods, OS X Mavericks

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Quote:
I am running an X1600 graphics card in the machine and assumed it would be ok to run at 75mhz..
I think you meant running it at 75Hz not MHz. Changing the refresh rate of the monitor will depend on what rates are available in System Preferences, Displays. Most likely the refresh rates that are not supported by that monitor will be grayed out. For example: My Samsung SyncMaster can only be set at 60Hz as other rates are not supported.
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