The Athlon II X2 & Phenom II X2: 45nm Dual-Core from AMDby Anand Lal Shimpi on June 2, 2009 12:00 AM EST
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Both the Athlon II X2 and Phenom II X2 are light on the power consumption. Our Athlon II X2 sample actually drew more power under load, possibly because of its larger L2 caches which operate at full clock speed rather than at the 2.0GHz un-core clock of the Phenom II's 6MB L3. Alternatively, it could just be poor BIOS power management support for the Athlon II at this stage.