In September 2009, AMD unleashed a torrent of personal computing potential by introducing the market to the first sub-$100 quad-core processor, the Athlon-II X4-620 Since then, like it has with the entire Athlon-II series, AMD has been releasing newer versions of their inexpensive quad-core CPUs In this article, Benchmark Reviews takes a look at AMDs latest release in the Athlon-II X4 line, the Athlon-II X4-640 ADX640WFK42GM AM3 Processor Built on the Propus die, the Athlon-II X4 series cuts costs by eliminating any L3 cache and limiting the L2 cache to 512KB per core In looking at the performance of the Athlon-II X4-640, we will compare it to other recent AMD offerings in a similar price range, the Athlon-II X2-260 and the Athlon-II X3-445.