the AMD Athlon X4 II 645, a quad-core chip that's Model on the Athlon X4 640. The headline improvement is the Addition of an extra 100MHz of frequency, Meaning the 645 runs at an Impressive 3.1GHz, making it AMD's Fastest quad-core Athlon chip. Also AMD Claims To Have Implemented a raft of more subtle tweaks and Change, But The Fact That Are Both the chips based on the C3 stepping of the Propus Indicates That These Changes are minor.

As a result, the X4 645 is still made with 45nm SOI process the Same as the X4 640 and retains the Same 128KB of Level 1 cache and 512KB of Level 2 cache per core. The X4 645 Also Lacks the still large pool of Level 3 cache That AMD's Phenom line of processors Enjoys II. The Lack of L3 cache Helps AMD Athlon IIs occurs at budget prices.

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At 94 pounds the 645 X4 has plenty of competition. Intel's excellent and immensely overclockable Pentium less Than the X4 645 and while it May Only Be A dual-core chip, The Fact That It's based on the Clarkdale design Means it's Able to process more instructions' per clock (IPC ) per core Than the X4 645. Also in competition with the X4 645 is the bottom end of Intel's Core i3 range and AMD's own triple-core Phenom and dual-core CPUs II.