主题：【原创】Apple 平板电脑发布会直播 -- AllenKid

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The Apple A4 is a SOC (system-on-chip), used in Apple's iPad tablet computer, which runs at 1 GHz.[1] It was announced on January 27, 2010.

It is designed by Apple’s in-house chip design department, formerly known as P.A. Semi.

The system on a chip combines the CPU with integrated graphics processing unit and other parts. The graphics processor design is likely to be a PowerVR SGX series 5 (the SGX545) core licensed from Imagination Technologies, which confirmed Apple was a licensee on 18th December 2009.[2] The A4 is capable of running OpenGL ES 2.x applications and possibly OpenGL 3.2 and OpenCL 1.0 applications.

The A4 is manufactured by Samsung, that also manufactures the iPhone 3GS and iPod Touch 3rd Generation CPUs, using a smaller 45nm manufacturing process.[3] The final silicon was available September 2009.[4]

As a proprietary designed CPU it is unlikely that it will be used outside of Apple's products. Competing designs featured in similar tablet products are Qualcomm's 1Ghz Snapdragon CPU, Texas Instruments OMAP 4 1Ghz CPU, and nVIDIA Tegra 2.