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PhoneNews claims they can “confirm” that Apple will speed up their MacBook Air with a new  CPU called the Penryn-class Intel Core 2 Duo processor, increasing the clock speed to 2 GHz and up. The story also notes that, since the processor requires more power, the Air will ship with a higher-capacity battery and 60-watt power adapter.

Engadget goes further, noting that clock speeds could (theoretically) reach 3.06GHz. Also, they speculate that the Air could feature improved integrated graphics if it adopts the Intel Centrino 2 chipset. As the air doesn’t have any room for a GPU.

Alternatively, Engadget notes that Intel plans to release several flavors of low-voltage Penryn chips in September, which might indeed be slated for the MacBook Air. Using these chips, however, would decrease the power requirements noted by PhoneNews, not increase them.

PhoneNews says national retailers have been alerted “to be prepared for the upgrade.” This may be part of several laptop announcements rumored to be happening in September.