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I am trying to upgrade my MacPro to Mountain Lion. After researching online it seems my model does not have a 64 bit compatible GPU. Is it possible to upgrade the GPU or would the entire motherboard need to be replaced?

The MacPro is a late 2007 model MacPro 2,1

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You need to provide a lot more information, including the particular model, CPU, etc. – user3463 Sep 7 '12 at 5:36
    
+1 for @RandolphWest. We do need your exact Macbook Pro make, for example (1,2) and year of manufacture (2006) etc. so we know what your exact configuration is, and how to go about helping you! – aliasgar Sep 7 '12 at 6:19
    
Updated question with year and model. – Lumpy Sep 7 '12 at 19:44

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