Apple underclocks A9X chipset on new 9.7-inch iPad Pro

Apple underclocks A9X chipset on new 9.7-inch iPad Pro
While the 12.9-inch Apple iPad Pro, and the 9.7-inch variant of the tablet both share the same Apple A9X chipset under the hood, the larger-screened model remains Apple's fastest tablet. That is because Apple has decided to underclock the A9X on the new tablet. And we know this because of a comparison Apple made between the chip in each iPad Pro, and the A7 chipset used in the Apple iPad Air.

According to information directly from Apple, the A9X chipset on the 12.9-inch iPad Pro features a CPU that is 2.5 times faster than the A7 chip. Graphics run 5 times faster. On the newly announced 9.7-inch iPad Pro, the A9X chipset has a CPU that run 2.4 times faster than the A7. The graphics chip is 4.3 times zippier.

Since both tablets have the same A9X SoC under the hood, any difference when comparing performance to the A7 has to be from Apple either overclocking the A9X on the 12.9-inch iPad Pro, or underclocking the chip on the 9.7-inch version of the tablet. We'd go with the latter.

As for the reason why Apple would do such a thing, it could simply be because the company wanted the larger screened version to remain the most powerful. After all, the larger slate uses a USB 3 based Lightning port allowing for faster charging times and data transfer speeds than seen with the USB 2 based Lightning port on the smaller tablet. Another theory is that Apple didn't want to tax the smaller battery used on the 9.7-inch version of the iPad Pro.

The bottom line is that the difference in speeds between the two different iPad Pro models will probably not be noticed unless you are performing the same task over both models with a stopwatch in your hand. Both models have enough power to give you the performance you need from a tablet that will be found in the kitchen and in the office.

source: AppleInsider

Related phones

iPad Pro
  • Display 12.9" 2048 x 2732 pixels
  • Camera 8 MP / 1.2 MP front
  • Processor Apple A9X, Dual-core, 2260 MHz
  • Storage 128 GB
  • Battery 10307 mAh
iPad Pro 9.7-inch
  • Display 9.7" 1536 x 2048 pixels
  • Camera 12 MP / 5 MP front
  • Processor Apple A9X, Dual-core, 2260 MHz
  • Storage 256 GB
  • Battery 7306 mAh



1. SamsungPhanboy

Posts: 765; Member since: Mar 31, 2015

The iPad Pro 9.7 has fail written all over it.

6. AlikMalix unregistered

I've been waiting for this since the day I fell in love with note 4's s-pen - for drawing.. iPad Pro was expensive, but the pencil is so much better for drawing than any other styles I tried - even my favorite s-pen. This iPad is right up my alley when I'm ready to upgrade my iPad 3 (2012). And it's more portable. Im hugely disappointed by the protruding camera again - to be honest I don't even need a camera on the iPad (people looks dumb taking photos or videos on that thing. I take my photos on my iPhone it instantly ends up on the iPad, PC, and my 5s - and you avoid looking silly. If everything works just like my experience with the original iPad Pro - this is gonna be my next iPad. Anyone wants to buy bunch of different stylus pens - don't need em - one pencil rules them all.

18. TechieXP1969

Posts: 14967; Member since: Sep 25, 2013

Have you ever tried the Bamboo styli from WACOM? Particularly the Bamboo Feel is very nice and feels exactly like a real pen. I would say it is an inkless pen for sure. Very smooth very precise. The SPen is ok. It was made to be small and used with the phone. But when I had my Galaxy Note 12.2, that tiny pen doesn't do so well so I bought one recommended to me by WACOM. The Feel is very nice, supports all the Note 3/4 pen features. Socks it didn't work on the Note 5 because it doesn't appear to use WACOM anymore. Or at least it's a more updated version.

25. AlikMalix unregistered

I own it, lol. Will be for sale as soon as I get the pencil. I spent over $185 on styluses to do what one Apple Pencil does alone

43. Plutonium239

Posts: 1214; Member since: Mar 17, 2015

The pen with the Surface Pro 4 is better.

44. AlikMalix unregistered

im not at liberty to discuss surface pro's pen - never tried it. The just aren't there - that's important to me - and trust me, I considered WP. You say it's better. What is it better at? Is it better than just note4 spen or Apple Pencil too? How is it better? Please don't reply with a blanket statements "it's just Better at everything" - that says absolutely nothing. I've used s-pen and I love it, but can live without it - then I used the pencil and I cannot live without it. Call me a fanboy or w/e. But I draw a lot for a hobby and work - pencil is just that great!!!

45. elitewolverine

Posts: 5192; Member since: Oct 28, 2013

There is other reviewers that have gone into more depth than what we will here. Right now people are using it for published works. I do use it. At first it had a skipping issue, an update later fixed that. It is amazing to use and feel. I cannot tell you the moment my brain triggered that I wasn't using a real pencil on my pro 4. I was using autodesk sketch app that was released in the windows store.

46. AlikMalix unregistered

That's a great drawing app. Very happy to hear it's on Windows.

47. Plutonium239

Posts: 1214; Member since: Mar 17, 2015

The new surface pen had interchangeable tips for different resistance levels for more realistic drawing/writing experiences. It is extremely accurate and the pressure sensitivity is amazing. The two buttons and the eraser button are extremely useful. I could not imagine using a Surface without the pen. It is extraordinary. The apple pencil costs twice as much and doesn't have as much functionality. The only think that I like about it is that it is rechargeable as opposed to the Surface pen's multiple batteries that are non-rechargeable. Many artists and professionals swear by the Surface pen as I do.

11. Coconut00

Posts: 485; Member since: Jan 13, 2015

I think that pricing it at $100 more than what the Air line used to sell at and not calling it the iPad Air 3 will have a negative impact on sales.

22. nctx77

Posts: 2540; Member since: Sep 03, 2013

Every Android fans wishful thinking lol! It won't sell because it's doesn't have the right name.....loooooooool

38. Coconut00

Posts: 485; Member since: Jan 13, 2015

It's not wishful thinking. The name is confusing and iPad sales are down and its price is up. I personally look forward to buying an iPad this year (most likely the Mini 4) so I don't say this because I hate Apple or iPads. Plus, I didn't say it wouldn't sell, I said it could have a negative impact on sales.

37. submar

Posts: 713; Member since: Sep 19, 2014

Apple once claimed stylus suck.

50. AlikMalix unregistered

Steve claimed that styluses suck if they're supposed to be used as PRIMARY input tool - finger is better - and they're absolutely right. Imaging typing your post using a stylus - letter by letter. See back then the PDAs touch input was inaccurate, scrolling required pushing arrows, so did zoom in and out. If u want to scribble something you needed a pointing device. Apple turned that around with iPhone and multitouch. Stylus are great and there are hundreds of different ones available for iOS including chap and expensive. But people use the to draw primarily - before iPhone people used them to avoid erroneous input when using a finger.

36. Arch_Fiend

Posts: 3951; Member since: Oct 03, 2015

The 9.7in pro will still perform better than the 12.9in pro because it has a lower screen resolution, I don't see how you think it will fail because of slight underclocking.

2. tyrionTheWise unregistered

And Apple fanboys compare it to mobile SoCs like SD 820, while it can't even sustain TDP limits in tablet form-factor. Then again, it's way better than the garbage SoCs android manufacturers are packing with their tablets. Even the tegra X1 doesn't hold a candle to the A9x. And guessing by the fact that we didn't see a tegra x2, I guess tegra is dead, leaving Apple uncontested in tablet SoC arena.

8. vincelongman

Posts: 5693; Member since: Feb 10, 2013

It will be interesting to see the A10X vs the Pascal Tegra Especially because this year is probably going to be the first in 2 years where Apple doesn't have the process advantage since they're are both probably going to be 16FF+

28. vuyonc

Posts: 1090; Member since: Feb 24, 2014

Pascal Tegra on a new Shield Tablet would be epic and considerably cheaper too. Mixed precision compute, 16nm FF+, better memory compression, slicker LPDDR4x RAM and maybe a Cortex A72 based Denver successor should do wonders for performance per watt. Even Raja Koduri from AMD said their new Polaris architecture (which probably doesn't have mixed precision) can easily fit in mobile devices now.

9. TylerGrunter

Posts: 1544; Member since: Feb 16, 2012

That´s what I was missing in the article. Suggesting that Apple undeclocked the A9X because they wanted the bigger tablet to be more powerful or to save battery is pure ignorance. Most likely Apple did it to reduce the TDP of the A9X to be suitable for a smaller form factor. At least that is the mos logical answer I have for it.

13. tacarat

Posts: 854; Member since: Apr 22, 2013

Then why not use a different chip? I know using the same chip for both saves them money, but since phones are using heat pipes now, is tdp really a good excuse?

16. vincelongman

Posts: 5693; Member since: Feb 10, 2013

Reducing the clock rates is probably cheaper than designing and fabbing another SoC TDP is a very good reason The 9.7 Pro has a smaller frame and battery compared to the 12" So it needs a slightly cooler and more power efficient SoC Reducing the clocks is the easiest and cheapest way to do that, basically all the other companies do it too

17. tacarat

Posts: 854; Member since: Apr 22, 2013

Underclocking because of heat was the shame of the SD 810.

23. nctx77

Posts: 2540; Member since: Sep 03, 2013


41. TylerGrunter

Posts: 1544; Member since: Feb 16, 2012

It´s not only a good excuse, it´s the most logical answer. Head pipes just distribute the heat, but are not able to dissipate the amount of head the chip produdes, si it does not increase TDP. For the rest read vincelongman post, he understand how SoCs work quite well.

42. tacarat

Posts: 854; Member since: Apr 22, 2013

I did. I agree with his logic. What I'm not following is that, yes, heat pipes distribute heat, but why is it sounding like that doesn't help enough with heat in general? I'm probably missing something. I'm also sure there were issues about selling a smaller ipad pro that's just as capable. There were probably ways around it they just chose to not implement.

35. stanislav

Posts: 136; Member since: Sep 22, 2014

Comparing tablet with mobile soc is kinda normal when we put in mind that very very few android tables have "tablet" soc. Most use old mobile socs way weaker than one in the modern phones like samsung which use some SD 652 and exynos 5433 in their best tablets

7. vliang86

Posts: 337; Member since: Oct 05, 2015


19. TechieXP1969

Posts: 14967; Member since: Sep 25, 2013

At what? You ever had a Galaxy Note 12.2? Oh it comes with a pen. Sure the iPad will be faster, but speed isn't everything. First off it allows you to split 4 apps on the screen, not just 2. Has all the Android advantages over iOS, the charging port is 3.0 something charges faster than the iPad and data transfers will also be faster. The iPad has the higher resolution, but the Note display is 2560x1600 making it higher then Quad HD. Plenty high enough for a year old tablet. Also supports SD cards too. To claim the iPad is better than all Android tablets simply makes you misinformed and dumb.

27. jellmoo

Posts: 2588; Member since: Oct 31, 2011

Good points. The two negatives in this regard though, are: 1) There is still a lack of good, dedicated tablet apps. This is one area where iOS has done better. They've managed to curate a better list of apps that run more smoothly on the iPad, when compared to Android offerings. 2) Updates are really slow or non-existent. Samsung hasn't been the best when it comes to keeping their tablets up to date when it comes to the latest firmware.

24. nctx77

Posts: 2540; Member since: Sep 03, 2013

They still make Android tablets? I thought all robots are on team Windows now with!

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