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[* black] Lurking deep within the phone, the [guide|2204|A4 processor] is the centralized unit that provides the iPhone 4 with the much needed computing power.
[* black] Replacing the Samsung-built ARM Cortex-A8-based CPU used in the 3GS, the new A4 processor in the iPhone 4 is rumored to run at 1 GHz, much like it does in its bigger sibling the [guide|2183|iPad].