Samsung Exynos 7420 power consumption measured: big improvements

Samsung Exynos 7420 power consumption measured: big improvements

Unlike Intel, chip makers in the mobile space are reluctant to give out details about their chips, leaving the task to developers to explore with microbenchmarks and reviewers to dig out fine details and reverse-engineer their efforts. Samsung's Galaxy S6 is no stranger to that practice as there are little public details available about the inner workings of its Exynos 7420 system chip.

It's a very interesting chip for a few reasons: it's the first 14nm system chip by Samsung, it has arrived before the competing FinFET 16nm process is made available by TSMC (rumors claims that this technological advantage might have won Apple to switch over to Samsung's fabs for the iPhone 6s family), and it seems to be a remarkably powerful chip.

Luckily, AnandTech's Andrei Frumusanu has published a deep dive on the Exynos 7420 system chip with separate looks at the major building blocks of this SoC: the big.LITTLE CPU that uses four high-performance Cortex A57 cores in combination with four low-power Cortex A53s, the new Mali T760 GPU, and the use of LPDDR4.

It's a fascinating read and we'd like to share a few of the most interesting conclusions AnandTech makes about the Exynos 7420. The first thing that most people would be interested in is - naturally - power consumption and how it is affected by the new 14nm process. What's measured in the charts below is average consumption per core first for the A53 cluster, and then for the A57 quad-core cluster, each followed by a comparison to power consumption by the respective big and LITTLE clusters in the Exynos 5433 (the chip that powers the Samsung Galaxy Note 4).


All of those improvements are worth applause: maximum power consumption of the A57 cores in the Exynos 7420 stands at 5.49W, much less than the 7.39W peak in the 5433. Interestingly, the disparity gets even higher when you look at different clock speeds: for instance, at 1.9GHz, the 7420 uses only 4.12W in comparison to the 7.39W of the 5433.

For more details and a real deep dive on the Exynos 7420, hit the source link right below.

Exynos 7420 block chart

Exynos 7420 block chart


source: AnandTech

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32 Comments

1. yoosufmuneer

Posts: 1518; Member since: Feb 14, 2015

thats why the GS6 gives atleast 3.5hrs of SoT. Moar could be achieved

2. TyrionLannister unregistered

I get 6-6.5 hours SoT with S6. With lighter use, I can get 8 hours. just some tweaks here and there to help with the usual lollipop drain.

5. Shocky unregistered

That's not typical at all and you know that, the average user is getting around 3-4 hours with normal usage and even then that's best case. Generally it's lower for me, best I've had is just over 4 hours.

9. TyrionLannister unregistered

Really. You should look into what's consuming your battery. Keep mobile data off as much as possible and use WiFi.

16. kabel

Posts: 146; Member since: Nov 06, 2011

What is the point of smartphone if data is turned off?! I need to get emails and i do not have a time to worry if i'm within WiFi range or not. I keep WiFi off at all time because i need mobile data. I keep GPS off at all time too and yet to get more than 3 hours SOT. SGS6 standby time is what it kills it for me. I do not have any background process besides exchange email. Checked the exchange account and that is not what is killing the battery ... Google Play Services kills the standby time on mine. I do not care for SOT

30. TyrionLannister unregistered

I'm not turning off the data you dumbass. I'm using WiFi until the bug is fixed.

17. Shocky unregistered

No I shouldn't, I've spoken to enough S6 owners in the real world and online to know 3-4 hours SoT is normal. What you're telling people is NOT normal, you must know that because there is no why your stupid enough to ignore all the feedback from users and reviews over the last 2 months.

11. yoosufmuneer

Posts: 1518; Member since: Feb 14, 2015

Really? Thats great battery life. Most tech youtubers reported that they got 3.5 hrs of SOT. Like everyone mentioned that.

18. Shocky unregistered

3.5hrs is perfectly normal and about what most users will get, it's best if you just ignore Tyrion.

26. Cod3rror

Posts: 142; Member since: Apr 06, 2013

3.5 hours is realistic and what normal users get. Everybody that gets 6+ hours must have a full time job of being Android power human management system; the brightness on the lowest, turning Wi-Fi, Cellular Data, Bluetooth, GPS on and off all the time. Who wants to do that? Only a few people, so they can say they 6 hours, but it's not a real time. The real time is when you use the phone normally, enjoy it and whatever you get at the end is what the time is.

27. Macready

Posts: 1811; Member since: Dec 08, 2014

I get 5 to 6 hours SoT without having to resort to the things you mentioned. Does that earn me a cookie for being different from what some here claim to be "normal"?

33. Shocky unregistered

No, you just have unusual usage habits. Congrats, your a bit strange.

21. mistercarter

Posts: 360; Member since: Sep 01, 2011

what kind of tweaks? minimum display brightness and basically turn off every connection so it works more like a Nokia 3310 than a smartphone? i dont buy this kind of phones just to look at it

23. shahrooz

Posts: 792; Member since: Sep 17, 2013

on kitkat I used xposed to automatically switch to 2G network on lock and keep data active for 10 minuts after lock. I also had the CPU underclocked automatically when screen was locked for some time. there are many tweaks... possibilities are endless.

32. Shocky unregistered

Not relevant, the Galaxy S6 was never running kitkat. Besides I always turn of the data connection when I'm done and I still barely eek out 3-4 hours most days.

29. TyrionLannister unregistered

Tweaks include disabling Samsung and google junk I don't ever use.

34. Shocky unregistered

Could you be more generic in your responses? It's hard to tell if your doing in on purpose because you don't have any real advice to give anyone or your just a bit dim.

28. barondebxl

Posts: 180; Member since: Nov 04, 2011

I never get less than 4 hours of screen on time with at least 14 hours of charge. This is the phone of the year when everything is considered...so far at least!

3. rd_nest

Posts: 1656; Member since: Jun 06, 2010

There is not much die shrink in TSMC's 16nm compared to 20nm. http://www.extremetech.com/wp-content/uploads/2014/12/Cell-SizeComparison.png

4. TyrionLannister unregistered

As consumers, why should we care about die shrinks. I only care about the performance and power efficiency improvements.

7. Shocky unregistered

You should care because die shrinks mean better performance and power efficiency.

8. TyrionLannister unregistered

It depends where the shrink is happening.

19. Shocky unregistered

???????????

6. waddup121 unregistered

sweet!

10. dennisfurlan

Posts: 28; Member since: Jun 22, 2015

Which raises the question: Why isn't the Exynos 7420 being used in the upcoming S6 Edge "Plus," according to all the published leaks? Instead, they're apparently going with the lesser Snapdragon 808, which I don't get, if it's true.

12. tedkord

Posts: 17135; Member since: Jun 17, 2009

Leaks mean nothing. Wait until the device is announced and confirmed.

15. My1cent

Posts: 370; Member since: Jan 30, 2014

Is SD808 cheaper than SD810? (cooler for sure)

13. Fardon

Posts: 96; Member since: Nov 24, 2014

Because its not meant to be Flagship level or compete with the Note 5...

20. dennisfurlan

Posts: 28; Member since: Jun 22, 2015

But the S6 edge is meant to be flagship level/premium, isn't it? Right now, the branding seems very confusing.

14. Freecableguy

Posts: 42; Member since: Jul 21, 2014

Exynos 5433 is still a beast. With that said, they did an awesome job with the Exynos 7420 and I look forward to see what Note 5 will pack.

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