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MacPro 4,1 CPU Delidding, Upgrade & Northbridge Thermal Paste Replacement - YouTube
Complete Mac Pro 4,1 soft- and hardware upgrade – All the way up to Big Sur | Jensd's I/O buffer
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2009 Mac Pro (Dual 2.66GHz/ATI 4870/6GB RAM/640GB HD) Review and Info
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Mac Pro 2009-2012 Dual CPU Service & Repair (2009, 2010, 2011, 2012) - iFixit Repair Guide
