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AMD X4 650 Amd X4 650 vs Amd X4 645 using Nuclearus. Amd X4 650 is 3.2Ghz and Amd X4 645 is 3.1Ghz. Amd X4 650 is Propus and Amd X4 645 is Propus. Amd X4 650 is Quad Core and Amd X4 645 is Quad Core."