After Intel dropped a Core i5, AMD quickly fires back slo-mo style with its own chip: a $99 quad core, dubbed the Athlon II X4 620, a 2.6GHz quad core isn’t just leftover parts swept off the factory floor, either. The Athlon II X4 is based on the familiar K10 microarchitecture in the Phenom and Phenom II, but it’s actually a newer, smaller die. In fact, the new chip has less than half the transistors of a Phenom II X4 processor. Much of the shrinkage comes at the expense of cache. While the Phenom II packs 6MB of L3, the budget Athlon II X4 features none. The TDP of the new Athlon II X4 chips (there are two, but only one is sub $100) is also considerably lower than the top-end Phenom II X4 965 Black Edition chip at 95 watts versus 140 watts. Other than the TDP and lack of L3 cache, the CPUs are essentially the same as their Phenom predecessors.
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