請問IPHONE 6 和PHONE6 PLUS到底有什麼厲害的地方 A8處理器分析和電池分析

IPHONE 6 和PHONE6 PLUS有什麼厲害的地方

A8處理器到底是雙核心還是四核心

我猜一定是雙核心官方只說提升25%效能並且能源效率提高50%

要同時做到提高效能和降低功耗這兩件事情可不簡單這兩件事情是相互矛盾的

高通之前的四核心或者是聯發科的八核心效能還輸給之前5S的 A7雙核心處理器
http://browser.primatelabs.com/android-benchmarks

GB3跑分資料庫

GB3的PC跑分資料庫

而且之前5S的A7雙核心時脈只有1.3Ghz 不到高通2.5Ghz的一半這就證明的同時脈效能比較高

用一個更低時脈的1.3G的雙核心就能擊敗時脈和核心數是它大約兩倍的S800處理器

這讓我想起AMD以前用K8微架構一半的時脈就比兩倍時脈高的P4-D雙核還快同時脈效能整整高出兩倍

後來英特爾又推出了Core系列用更高的同時脈效能就比夏了AMD更多時脈和核心數

目前桌上型電腦的Core系列晶片電晶體也才10億個上一代5S的A7同樣也是10億個這下A8又爆增到20億個

多出兩倍所以可以同時提高效能25%和降低功耗50% 我想大概也是蘋果最早吃到台積電20nm的單

而高通哪時後才要出20nm處理器到時後大家在比比看了..........

-----------------很厲害的地方第二點

IPHONE 6+大概就是續航力可以達到上網瀏覽12小時連續使用........

而且可以在大型3D線上遊戲上同時提高效能和使用時間不會玩一下就沒電

這裡有一個資料庫裡面有秀出200多隻手機的上網看影片和通話時間待機時間的電池續航力

都使用相同的方法測量建立的一個資料庫銀幕亮度一律調整為50%

電池續航力和使用時間資料庫

如果是要推電池容量除了某些電池容量堆到4000mah解析度還只有720P

或是使用MT6589這種省電低效能的CPU 很少手機能超過12小時 M8和M7和LG G2都沒有達到這種程度

但是蘋果官方目前為止卻沒有公佈它的電池容量mah或是 Wh瓦時電能

到時後我們再來看看它的電池容量大概是多少以提高CPU能源效率50%

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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的旋風微架構已經達到6 IPC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的旋風微架構更是已經達到前兩代的CORE I級別

A8 旋風2代已經超過了目前的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以下-----------------

With their iPhone keynote behind them, Apple has begun updating some of their developer documentation for iOS to account for the new phone. This of course is always a fun time for tech punditry, as those updates will often include information on the hardware differences in the platform, and explain to developers the various features that different generations of hardware can offer developers.

To that end we have compiled a short analysis of the A8 SoC based on these documents and other sources. And we believe that at this point we have a solid idea of the configuration of Apple's latest SoC.
Apple SoC Specifications
Apple A6 Apple A7 Apple A8
CPU Swift @ 1.3GHz(x2) Cyclone @ 1.3GHz (x2) Enhanced Cyclone @ 1.4GHz (x2)?
GPU PVR SGX543MP3 PVR G6430 PVR GX6650
RAM 1GB LPDDR2 1GB LPDDR3 1GB LPDDR3?

A8』s GPU: Imagination PowerVR Series6XT GX6650

On the GPU front this year appears to be especially bountiful. After being tipped to an update for Apple's Metal Programming Guide, we can now infer with near certainty that we know what the A8 GPU is.

New to this edition of the Metal Programming Guide is a so-called iOS_GPUFamily2, which joins the existing iOS_GPUFamily1. We already know that the iOS_GPUFamily1 is based around Imagination's PowerVR Series 6 G6430 GPU, so the real question is what does iOS_GPUFamily2 do that requires a separate family? The answer as it turns out is ASTC, the next generation texture compression format is being adopted by GPU vendors over the next year or so.

Imagination's PowerVR Series6 family of GPUs predates ASTC and as a result iOS_GPUFamily1 does not support it. However we know that Imagination added support for it in their Series6XT designs, which were announced at CES 2014. Coupled with the fact that Apple's documentation supports the idea that all of their GPUs are still TDBR (and thus PowerVR), this means that the GPU in the A8 must be a Series6XT GPU in order for ASTC support to be present.

This leaves the question of which of Imagination's 4 Series6XT Apple is using. Imagination offers a pair of 2 core designs, a 4 core design (GX6450), and a 6 core design (GX6650). Considering that Apple was already using a 4 core design in A7, we can safely rule out the 2 core designs. That leaves us with GX6450 and GX6650, and to further select between those options we turn to Apple's A8 performance estimates.
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

A8 is said to offer 84x the GPU performance of the iPhone 1, while last year Apple stated that the A7 offered 56x the iPhone 1』s performance. As a result we can accurately infer that the A8 must be 1.5x faster than the A7, a nice round number that makes it easier to determine with GPU Apple is using. Given Apple's conservative stance on clockspeeds for power purposes and the die space gains from the 20nm process, accounting for a 50% performance upgrade is easily done by replacing a 4 core G6430 with the 6 core GX6650. At equal clockspeeds the GX6650 should be 50% faster on paper (matching Apple's paper numbers), leading us to strongly believe that the A8 is utilizing a PowerVR Series6XT GX6650 GPU.

Once the iPhone 6 is out and Chipworks can photograph the SoC, this should be easy to confirm. If Apple is using a GX6650 then the die size of the GPU portion of the A8 should be very similar to the die size of the GPU portion of the A7. Otherwise if it is the 4 core GX6450, then Apple should see significant die size savings from using a 20nm fabrication process.
A8』s CPU: A Tweaked Cyclone?

Though we typically avoid rumors and leaks due to their high unreliability, after today's presentation by Apple we have just enough information on A8』s CPU performance to go through the leak pile and start picking at leak. From that pile there is one leak in particular that catches our eye due to the fact that it matches Apple's own statements.

On Monday night a supposed Geekbench 3 score of the iPhone 6 was posted. In this leak the iPhone 6 was listed as having a single-core score of 1633 points and a multi-core score of 2920 points. Curiously, these values are almost exactly 25% greater than the Geekbench 3 scores for the iPhone 5S (A7), which are 1305 points and 2347 points respectively.

The fact that ties all of this data together is that in their iPhone 6 presentation, Apple informed viewers that the iPhone 6 is 25% faster than the iPhone 5S. This data was later backed up with their latest CPU performance graph, which put the iPhone 6 at a score of 50x versus a score of 40x for the iPhone 5S.

Given Apple's data, it looks increasingly likely that the leaked Geekbench 3 results for the iPhone 6 are in fact legitimate. The data leaked matches Apple's own performance estimates, and in fact does so very well.

In which case we can infer a couple of points about the A8』s CPU, starting with the clockspeed. Given no other reason to doubt this data at the moment and given Apple's preference for low clocked SoCs, the 1.4GHz reading appears legitimate. In which case this would be a 100MHz increase over the 1.3GHz A7 found in the iPhone 5S.

However the fact that it's a 100MHz increase also means that clockspeeds alone cannot account for the full 25% performance gain that Apple is promoting and that these Geekbench results are reporting, as 1.4GHz is only a roughly 8% clockspeed increase over 1.3GHz. This in turn means that there must be more going on under the hood to improve the A8』s CPU performance other than clockspeed alone, which rules out a straight-up reuse of Apple's Cyclone CPU.

Since Apple already had a solid ARMv8 architecture with Cyclone, there's no reason to believe that they have thrown out Cyclone so soon. However this does strongly suggest that Apple has made some unknown revisions to Cyclone to further boost its single-threaded (Instruction Level Parallelism) performance. What those tweaks are remain to be seen as we would need to be able to benchmark the A8 in depth to even try to determine what Apple has changed, but for the moment it looks like we're looking at an enhanced or otherwise significantly optimized version of Cyclone. And given Apple's already high ILP, squeezing out another 16% or so would be a significant accomplishment at this time, especially for only a year's turnaround.
1GB of RAM

Last but not least, the apparent validity of the Geekbench 3 leak means that one last piece of information on the A8 can apparently be confirmed: the earlier rumors about it being paired with 1GB of RAM are true. Unfortunately Apple's official product image of the A8 is of no help here – it's clearly a doctored version of the A7 image based on the product numbers attached – but this information is consistentwith earlier rumors based on leaked images of the real A8, which had also suggested the SoC contained 1GB of RAM. Again this is based on what we believe is a sound assumption that the Geekbench 3 leak is accurate since it so closely matches Apple's own CPU performance estimates, but at this point we don't have any substantial reason to doubt the data.

Image Courtesy Macrumors

The good news is that this is going to be the easiest aspect of the iPhone 6 to confirm, since diagnostic apps will be able to query the phone for the RAM amount. So one way or another we should know for sure come September 19th.

http://www.anandtech.com/show/8514/analyzing-apples-a8-soc-gx6650-more

該網站給出的評論說Apple的旋風架構不像是高通的移動CPU 到是很像桌面級PC的架構

IPC是7有多猛 ARM Cortex-A57 還沒上市只有5的IPC

Cortex A15也只有IPC 4 也就是每時鐘周期處理4條指令也就是MIPS/MHz=4

桌上型電腦I7 4770K的Haswell微架構也只不過達到每時鐘周期8條指令

法國拆解網站公佈很可能5.5吋的6+ 是2915mah電池容量------------------

5.5 吋 iPhone 6 電池容量確認為 2,915 mAh

2014-09-10 9:25 #1