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Apple A8X

Apple A8X

The Apple A8X is a high-end ARM SoC (System on a Chip) introduced in October 2014 alongside the iPad Air 2. The three CPU cores are clocked slightly higher than the two inside the Apple A8 (+100 MHz). Apple claims a 40% improvement over the 1.3 GHz Apple A7 compared to just 20% from the A8. Furthermore, the A8X integrates a much more powerful GPU (2x 4-core PowerVR Series 6XT (Rogue) GXA6850) as well as a 128-bit LPDDR3 memory controller.

Architecture 

With Cyclone 2, Apple has managed to improve the already high performance-per-clock of the original Cyclone core (Apple A7) by another 10 to 15 percent. Neither Qualcomm's Krait nor ARM's Cortex-A57 can compete with the resulting IPC. The exact design changes have not been revealed, but we would expect enlarged caches and registers as well as an optimized branch prediction. As an ARMv8 architecture, Cyclone 2 is 64-bit capable.

Performance

Compared to the previous Apple A7, the A8X offers about 20 - 70 percent more performance. Especially the multi-thread performance has been significantly improved thanks to the third CPU core, whereas the single-thread power is just slightly higher (~20 percent). According to Geekbench 3 scores, the A8X is the fastest mobile ARM-SoC as of late 2014. However, the chip clearly benefits from the 64-bit support in the iOS version of the benchmark. Without this advantage, Nvidia's Tegra K1 (Denver) dual-core is still somewhat faster in single-thread software (but slower in multi-thread tests).

Graphics

In contrast to previous speculations, the A8X integrates an 8-cluster PowerVR Series 6 (Rogue) GXA6850 consisting of two GX6450 GPUs (2x 4 clusters) instead of a single GX6650 (6 clusters). The name GXA6850 has been created by Anandtech, the design may also be called a GX6450MP2.

Each cluster offers four FP16 and two FP32 ALUs, leading to a compute power of about 230 GFLOPS FP32 at 450 MHz (clock rate estimated). The GXA6850 does not only beat the Qualcomm Adreno 420 (Snapdragon 805), but also the Nvidia Tegra K1 by a small margin. Thus, the GXA6850 is one of the fastest tablet GPUs as of 2014 and can handle even the most demanding mobile games in high resolutions. Among others, the GPU supports OpenGL 3.x/4.x, OpenGL ES 3.0 as well as DirectX 10.

Power Consumption

In contrast to previous Apple SoCs, the A8 und A8X are manufactured by TSMC instead of Samsung. Using a brand-new 20 nm process, the SoC consists of a whopping 3 billion transistors. Power consumption should be similar to competing high-end SoCs by Qualcomm or Samsung.

SeriesApple
CodenameCyclone 2

Series: Cyclone 2

Apple A8X « 1.5 GHz3 / 3 cores4 MB L3 Cyclone 2
Apple A8 compare1.4 GHz2 / 2 cores4 MB L3 Cyclone 2
Clock Rate1500 MHz
Level 1 Cache384 KB
Level 2 Cache2 MB
Level 3 Cache4 MB
Number of Cores / Threads3 / 3
Transistor Count3000 Million
Manufacturing Technology20 nm
Die Size128 mm2
FeaturesARMv8 Instruction Set, PowerVR GXA6850 (2x 4 Cluster Rogue), 128 Bit LPDDR3 Memory Controller
GPUPowerVR GX6650
64 Bit64 Bit support
ArchitectureARM
Announcement Date10/16/2014

Benchmarks

- Range of benchmark values for this graphics card
- Average benchmark values for this graphics card
* Smaller numbers mean a higher performance

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» Mobile CPU Comparison
Comparison of all mobile CPU series

» Mobile Processors - Benchmarklist
Benchmarklist of all known CPUs that are used in laptops (desktop and laptop CPUs)

Other CPUs of the series

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» HiSilicon Kirin 9000E
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» MediaTek Dimensity 1300
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» MediaTek Dimensity 8100
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» MediaTek Dimensity 1200
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» MediaTek Dimensity 8200-Ultra
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» HiSilicon Kirin 9000W
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» Google Tensor
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» HiSilicon Kirin 990 5G
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» HiSilicon Kirin 990
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» MediaTek Dimensity 8020
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» MediaTek Dimensity 1100
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» MediaTek Dimensity 1000+
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» MediaTek Dimensity 7050
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» MediaTek Dimensity 7030
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» MediaTek Dimensity 1080
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» MediaTek Dimensity 920
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» MediaTek MT8188J
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» HiSilicon Kirin 820e
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» UNISOC T610
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Surrounding CPUs

+ Intel Atom Z3775
   4x 1.46 GHz - 2.39 GHz
+ Intel Atom Z3775D
   4x 1.49 GHz - 2.41 GHz
+ Intel Atom Z3770
   4x 1.46 GHz - 2.4 GHz
+ Intel Atom Z3770D
   4x 1.5 GHz - 2.41 GHz
+ Intel Atom x5-Z8500
   4x 1.44 GHz - 2.24 GHz
» Apple A8X
   3x 1.5 GHz
- Nvidia Tegra K1 (Denver)
   2x 2.3 GHz
- Mediatek Helio X20 MT6797
   10x 2.3 GHz
- Mediatek MT8176
   6x 2.1 GHz
- Mediatek Helio P25
   8x 2.6 GHz
- Mediatek MT8173
   4x 2.4 GHz