jaffrry wrote:
等真正能用了,你再叫...(恕刪)
中國銀聯已經和apple在談了，連ios 8都有代碼，
那安卓的用戶，怎麼搞定安全認證？
當美國大陸都用了，台灣銀行業者會不推嗎？
是需要時間，但肯定比目前台灣NFC android複雜愚蠢的認證方式好太多，
因為連第三方支付，apple pay也可以運作。
宏大濕 wrote:
阿不就是強在原生系統...(恕刪)
跟原不原生無關你先了解什麼叫虛擬化技術VM
硬體差距也不小A8的Instructions per cycle (IPC)時鐘週期指令數是和英特爾CoreI7 可以達到8
A7已經達到6了 A7在提升25%效能但是時脈只增加8% 卻提升25%效能 所以IPC估計是7
Instructions per second (IPS)/mhz
之前A6的手工佈線已經夠猛了
A7更是已經達到前兩代的CORE I級別
A8已經超過了目前的CORE I系列的IPC
https://en.wikipedia.org/wiki/Instructions_per_second
A7的SoC雖然有10億晶體管 但是它是整個SOC 包含DSP GPU 等等等的單元 CPU只佔17%面積
A8雖然有20億電晶體 但是它的GPU提升50%效能 從4單元SP提升到6單元SP GPU的提升本身吃掉很多電晶體
所以提給CPU的面積不多 卻能持續提高效能
AnandTech網站分析很有可能是增加了內部指令和執行管線的平行性
As expected from this year's iPhone keynote, Apple has announced a new member of their internally developed family of ARM SoCs.
The latest SoC, dubbed A8, is Apple's first SoC built on the 20nm process, and among the first SoCs overall to be built on this process. Apple notes that it has 2 billion transistors and is 13% smaller than the A7, which would give it upwards of twice as many transistors as the A7 and would put the die size at about 89mm2.
Image courtesy The Verge
From a performance perspective Apple is promising 25% faster CPU performance than A7. As is usually the case with Apple, they aren't talking about the underlying CPU core – though this is a problem we're working to rectify – so it remains to be seen how much of this is due to CPU architectural upgrades and how much is from clockspeed improvements afforded by the 20nm process. Apple just introduced their 64bit Cyclone core last year, so it stands to reason that just a year later and with the transition to 64bit already completed, A8 packs a CPU that is similar to Cyclone.
Apple SoC Evolution
CPU Perf GPU Perf Die Size Transistors Process
A5 ~13x ~20x 122m2 <1B 45nm
A6 ~26x ~34x 97mm2 <1B 32nm
A7 40x 56x 102mm2 >1B 28nm
A8 50x 84x 89mm2 ~2B 20nm
Meanwhile Apple is being even less specific about the GPU, but from their published baseline performance comparisons against the iPhone 1, the A8 is said to be 84x faster on graphics. This compares to a published figure of 56x for the A7, which implies that the A8』s GPU is 1.5x faster than the A7』s. Given Apple's conservative stance on clockspeeds for power purposes and the die space gains from the 20nm process, it seems likely that Apple has upgraded from a 4 core PowerVR GPU to a 6 core PowerVR GPU, likely the flagship GX6650, which would account for the 50% performance gain right there.
Finally, Apple notes that the A8 is designed to be 50% more energy efficient than the A7. Some of these efficiency gains would come from gains due the 20nm process, however this large of a gain would indicate that Apple has done additional work at the architectural level to improve efficiency, as smaller manufacturing nodes alone do not see these kinds of gains.
Update: We have posted our initial A8 analysis here
http://www.anandtech.com/show/8504/apple-announces-a8-soc
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