Apple A8X

Apple A8X
Apple A8X chip
General information
LaunchedOctober 16, 2014
DiscontinuedMarch 21, 2017
Designed byApple Inc.
Common manufacturer(s)
Product codeAPL1012
Performance
Max. CPU clock rate1.5 GHz
Cache
L1 cachePer core: 64 KB instruction + 64 KB data
L2 cache2 MB shared
L3 cache4 MB
Architecture and classification
ApplicationMobile
Technology node20 nm
MicroarchitectureTyphoon
Instruction setARMv8-A: A64, A32, T32
Physical specifications
Cores
  • 3
GPU(s)PowerVR Series6XT GXA6850 (8 cores)
Products, models, variants
Variant(s)
History
Predecessor(s)Apple A7
Successor(s)Apple A9 (iPad 5)
Apple A9X (iPad Pro)

The Apple A8X is a 64-bit ARM-based system on a chip (SoC) designed by Apple Inc. and manufactured by TSMC. It first appeared in the iPad Air 2 and only is used in the iPad Air 2, which was announced on October 16, 2014. It is a variant of the A8 inside the iPhone 6 family of smartphones and Apple states that it has 40% more CPU performance and 2.5 times the graphics performance of its predecessor, the Apple A7. The latest software update for the iPad Air 2 using this chip was iPadOS 15.7.9, released on September 11, 2023, as it was discontinued with the release of iPadOS 16 in 2022 due to hardware limitations of the A8X.

Design

The A8X has three cores clocked at 1.5 GHz, a more powerful GPU compared to the A8 and it contains 3 billion transistors. With an extra 100 MHz and an additional core, the A8X performs around 13% better on single threaded and 55% better on multithreaded operations than the A8 inside the iPhone 6 and iPhone 6 Plus.

Further comparison to the A8 shows that the A8X uses a metal heat spreader, which the A8 does not, and it doesn't use the package on package configuration with included RAM which the A8 does. This is similar to how the older "X" variants, the A5X and A6X, were designed. Instead the A8X in the iPad Air 2 uses an external 2 GB RAM module.

In a first for Apple, the A8X is reported to have a semi-custom GPU. The A8X uses an 8-cluster GPU based on Imagination Technologies PowerVR Series 6XT architecture. Officially, the largest implementation of Rogue is a 6-cluster design, indicating that Apple has made customizations to the design in order to provide higher performance. This GPU is referred to as the GXA6850, with the "A" denoting the Apple customization.

The A8X has video codec encoding support for H.264. It has decoding support for H.264, MPEG‑4, and Motion JPEG.

Patent litigation

The A8X's branch predictor has been claimed to infringe on a 1998 patent. On October 14, 2015, a district judge found Apple guilty of infringing U.S. patent US 5781752, "Table based data speculation circuit for parallel processing computer", on the Apple A7 and A8 processors. The patent is owned by Wisconsin Alumni Research Foundation (WARF), a firm affiliated with the University of Wisconsin. On July 24, 2017, Apple was ordered to pay WARF $506 million for patent infringement. Apple filed an appellate brief on October 26, 2017, with the U.S. Court of Appeals for the Federal Circuit, that argued that Apple did not infringe on the patent owned by the Wisconsin Alumni Research Foundation. On September 28, 2018, the ruling was overturned on appeal and the award thrown out by the U.S. Federal Circuit Court of Appeals. The patent expired in December 2016.

Products that include the Apple A8X

See also


This page was last updated at 2023-12-05 14:56 UTC. Update now. View original page.

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