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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 38,477
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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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Certain iMac models had a removable graphics card (daughter card) that plugged into the logic board. Most iMacs and all Mac notebooks use graphics that are soldered to the logic board which means the entire logic board would have to be replaced.

You can check with iFixit: The free repair manual to see what your model iMac uses. My understanding is that it's fairly difficult to remove the plug in type graphic cards since they're located on the back side of the logic board. Make sure you have your model number on hand when you visit that site.
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