File:Apple A8 system-on-a-chip.jpg|
Apple A8 chip, used on iPhone 6 and iPhone 6 Plus
|Produced||From September 9, 2014 to Present|
|Designed by||Apple Inc.|
|Max. CPU clock rate||1.4 GHz|
|Min. feature size||20 nm|
|Instruction set||A64, A32, T32|
|Microarchitecture||Cyclone gen 2, ARMv8-A-compatible|
|L1 cache||Per core: 64 KB instruction + 64 KB data|
|L2 cache||1 MB shared|
|L3 cache||4 MB|
|GPU||PowerVR Series 6XT GX6450 (quad-core)|
The Apple A8 is a 64-bit ARM based system on a chip (SoC) designed by Apple Inc. It first appeared in the iPhone 6 and iPhone 6 Plus, which was introduced on September 9, 2014. Apple states that it has 25% more CPU performance and 50% more graphics performance while drawing only 50% of the power compared to its predecessor, the Apple A7.
The A8 is manufactured on a 20 nm process by TSMC, which replaced Samsung as the manufacturer of Apple's mobile device processors. It contains 2 billion transistors. Despite that being double the number of transistors compared to the A7, its physical size has been reduced by 13% to 89 mm2 (consistent with a shrink only, not known to be a new microarchitecture). It has 1 GB of LPDDR3 RAM included in the package.
Early benchmarking using the Geekbench application suggests that the processor is dual core, and has a frequency of 1.38 GHz, supporting Apple's claim of it being 25% faster than the A7. It also supports the notion of this being a second generation enhanced Cyclone core, and not an entirely new architecture which would supposedly mean a more significant performance gain per Hz.
On October 16, 2014, Apple introduced a variant of the A8, the A8X, in the iPad Air 2. Compared to the A8, the A8X has improved graphics and CPU performance due to one extra core and higher frequency.
Products that include the Apple A8
- Apple system on chips, the series of ARM-based system-on-a-chip (SoC) processors designed by Apple for their consumer electronic devices.
- Comparison of ARMv8-A cores
- Apple A8X
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- Alleged iPhone 6 Geekbench Results Reveal 1.4 GHz Dual-Core A8 Chip, 1 GB of RAM
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- Apple - iPhone 6 - Technology