The AMD Athlon II X4 635 is the fastest quad-core processor in the Athlon II series with its overall clock frequency of 2.9GHz. With a street price of $127 and just a 100MHz boost over its predecessor is the Athlon II X4 635 worth it? Read on to see how it performs in the benchmarks and to see how it handles being overclocked on our AMD 785G test system.