Apple A5X

The last operating system update Apple provided for a mobile device containing an A5X (third-generation iPad cellular models) was iOS 9.3.6, which was released on July 22, 2019 as it was discontinued with the release of iOS 10 in 2016.

Design

Apple designed the A5X chip specifically for the third-generation iPad to provide the additional graphical performance it required for its new Retina display. The A5X chip features a dual-core 45 nm ARM Cortex-A9 CPU with a clock rate of 1 GHz, and a quad-core 32 nm PowerVR SGX543MP4 GPU with a clock rate of 250 MHz. Compared to the A5, the memory interface of the A5X is twice the size. The A5X memory interface subsystem utilizes four 32 bits wide LPDDR2 memory controllers.

Unlike the Apple A4 and the A5, the A5X uses a metal heat spreader (along with thermal paste) to cover the flip chip underneath. The die takes up 162.94 mm² of area—a 36.5% increase in area used over the 119.32 mm² die of the S5L8940 version of the A5. The A5X does not use the package on package (PoP) method of installation to support RAM—RAM is found externally from the A5X chip.