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We know the details of the successor to the ARM Cortex A57. This is the future of our smartphone SoC, this is the ARM A72.
In February ARM announced the new architecture of high-performance core, the Cortex A72 wrapped in mysteries and doubts resolved. Yesterday at an event in London reported to the media many details that are worth being analyzed due to the importance that have the architecture in the ARM processors are inside a large part of the smartphones available in the market, although the trend is that of designing an architecture itself.
ARM Cortex A72 is the direct successor to Cortex A57 we usually find in the stack quadcore high Big.little Octacore (usually 4xA57 + 4XA53). In this video explains well. The A72 takes that design, but improvement in all key aspects . The nomenclature is a marketing ploy to allow consumers to more easily differentiate the major differences between design efficiency (A53) and one output (A57). I often read glorify the “Octacore processors” when in fact there are two quadcore that work depending on the needs of the task manager. Moreover, in some cases manufacturers use two stacks of four cores A53 architecture but at different speeds. Something to consider the less questionable and perhaps intended more for marketing than optimal performance.
The main advantage ARM wanted to make clear is the FinFET process (you can learn more through this video) Samsung and TSMC 14nm and 16nm are respectively (no tricks when measured, but the improvement is large in any case). Because of this design and manufacturing process, the cores may operate at higher speeds than A57. According to ARM the clock to which we should expect is around the 2.7GHz on a 14nm manufacturing process or 16nm in high-end smartphones to come. The A57 can run faster perfectly, but will only make sense when used in large stacks for server high performance within the greater efficiency of the ARM architecture.
Although the ARM Cortex A72 is intended to be implemented in manufacturing processes 14 or 16nm, ARM has wanted to include in the slideshow unique performance improvements architecture. That is, an apple compared against apple reporting data Cortex A72 28nm, something very interesting as Qualcomm and Mediatek produce SoC based Cortex A72 28nm this year processors (eg 618 and 620 of the Snapdragon family). The improvements are not amazing, but significant if we consider that are achieved without loss in nanometer manufacturing process.
According to data from the ARM Cortex A72 is promise . Depending on the workload increased 20 to 60% of the IPC (instructions per clock) from the Cortex A57 is ensured. The reduction in latency between functional blocks of a CPU makes higher clock frequencies are harder to reach, but this is solved with reduced area and consumed and dissipated energy that can make the A72 runs at 2.7GHz (2.5 the A57 Ghz). In terms of energy efficiency, the A72 is a 18-30% more efficient than the A57 .
ARM has emphasized very important that preliminary benchmark seem to corroborate the performance singlecore which is almost always the most important. They promise a substantial improvement and according to preliminary data would equal or improve to the best architectures own.
- The yield in this stack 2xA72 + 4xA53 + 4xA53’s great to be a SoC midrange and 28nm manufacturing process, with DDR4 bus and 14nm process can see figures so far seen only on a desktop.
I was excited about what he has shown ARM. The architecture is a clear improvement in key parts of a core design: performance, consumption and area. The A57 came in the third quarter of last year and can be found in the Snapdragon 810 and the Exynos 7420 Samsung Electronics. It is possible that his successor arrives in a few months as we are already seeing in the designs of Qualcomm, Inc. and Mediatek.
The A72 is expected updating and improving its shortcomings as A57 solving the problem of not sustain the maximum clock frequency for a long time, and improving efficiency by the size reduction. It will be interesting to see how manufacturers design their own architectures, or come in the new Galaxy Note 5 Exynos the example
- end. Note: changes in architecture are an important part, but also its implementation. Recall the SD 810 eg
- anandtech well explained improvements in architecture if you want Delve deeper into the subject and have expertise.
April 24, 2015
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