Playing With Power: A Look At Nintendo Switch Power Consumptionby Ryan Smith on March 6, 2017 12:00 PM EST
Last week was of course the launch of Nintendo’s eagerly anticipated Switch console. The company’s latest handheld console, the Switch is a bit of an odd duck in pretty much every way. It departs from Nintendo’s traditional and well-established clamshell design in favor of a larger tablet, and under the hood Nintendo has stepped away from their typical highly-custom low-power SoC in favor of a rather powerful Tegra design from NVIDIA. Given that the 3DS was essentially an ARMv6 + OpenGL ES 1.x device, I can’t overstate just how significant of a jump this is under the hood in going to the ARMv8 + OpenGL ES 3.2/Vulkan class Tegra SoC. Nintendo has essentially jumped forward 10 years in mobile technology in a single generation.
|Handheld Game Console Specification Comparison|
|Nintendo Switch||New Nintendo 3DS XL||Sony PlayStation Vita Slim|
|SoC||CPU||4x ARM Cortex-A57||4x ARM11||4x ARM Cortex-A9|
|DMP PICA200||IMG PowerVR SGX 543MP4|
|Display||6.2-inch 1280x720p LCD
|Top: 4.9-inch 800x240
Bottom: 4.2-inch 320x240
|Size||102 x 239 x 13.9 mm, 297g (tablet only)
|160 x 93.5 x 21.5 mm, 329g||85.1 x 183.6 x 15 mm, 219g|
2.5 to 6.5 Hours
3.5 to 7 Hours
4 to 6 Hours
|Storage||32GB NAND + microSDXC||1GB NAND + microSDHC||1GB NAND or Proprietary Card|
|Wireless||2.4/5GHz 2x2 802.11ac
|I/O||Console||USB Type-C||Proprietary (USB Compatible)||Micro-USB|
|Dock||1x USB 3.0
2x USB 2.0
1x HDMI 1.x
1x USB-C (power only)
In any case, in between benchmark runs for other projects over the weekend, I’ve been poking and prodding at the Switch to see if there was anything interesting to find. Nintendo still hasn’t disclosed low-level specifications – nor was I expecting them to – so Digital Foundry’s unofficial analysis remains the best we’re going to see for now. And for a look at the physical layer, iFixit has once again done another one of their wonderful teardowns with the Switch, identifying many of its supporting chips and confirming that the “HD Rumble” motor is indeed a linear actuator, though oddly enough one that works on its short axis instead of its long axis.
Nintendo Switch: Playing With Power
However one area that I have had some success with is power measurement. And this is another area where the Switch is a bit of an odd duck, leading to some confusion around the Web judging from some of the comment posts I’ve seen elsewhere. USB Type-C has been shipping in devices for a couple of years now, so it’s hardly a new standard, but given the slow upgrade cycle of PCs and smartphones it still isn’t an interface that the majority of consumers out there have dealt with. Furthermore due to its use case as a game console, the Switch is unlike any other USB Type-C device out there (more on this in a second). So I opted to spend some time profiling the device’s power consumption, in order to shed some light on what to expect.
First off then, what makes the Switch such an odd duck here? This is merely anecdotal, but one of the big hang-ups I’m seeing is that a lot of people aren’t accustomed to using what’s essentially a high-power tablet that’s running at fill-tilt at all times. The secret to the long battery life (and clockspeed turboing) of the iPad and other tablets relative to their size is that they spend the vast majority of their time idling. It doesn’t take a lot of energy at the SoC level to display text or watch a video; the SoC is only called on in short bursts to render something before it goes back to sleep. The Switch, on the other hand, spends the vast majority of its time gaming, meaning the SoC is frequently in its highest power state.
The fact that the Switch lives most of its life at two extremes – asleep or running at full speed – means that it’s a bit unintuitive what to expect from it when it comes to power consumption. Or, for that matter, what to expect when charging it. So, in what’s ultimately an excuse for me to play with a new toy, Satechi’s USB Type-C power meter, I’ve been profiling the power consumption between the Switch and its AC adapter. As a bit of a heads up, the Satechi meter isn’t perfect – the device has to draw a bit of power itself – so if I wanted to be more rigorous about this I’d need to do a proper multimeter setup. But for some quick testing, Satechi’s meter works well enough, especially given the fact that its own power consumption is a drop in the bucket compared to the Switch’s.
Finally, looking at the specifications of the Switch, there are two numbers I want to point out. The first is the power rating of the console’s AC adapter: 15V @ 2.6A, or 39 Watts. This power adapter is quite powerful, more powerful in fact than the 29W adapter Apple includes with the modern 12-inch MacBook. Meanwhile the second number I want to point out is stamped into the bottom of the dock, and that’s the output power rating of the USB-C male port built into said dock for the Switch to connect to. It’s only rated for 15V @ 1.2A, for a total of 18W.
The difference between the two is due to the fact that the Switch dock itself plays host to 3 USB Type-A ports, including a USB 3.0 port on the rear. As a result the power adapter for the Switch apparently needed to be quite a bit oversized to ensure that it never faces a load larger than it can handle. Besides running the Switch, it also potentially needs to be able to power a USB hard drive and charge a couple of Pro Controllers, all of which can add up quickly. Consequently it’s the Dock’s output rating of 18W that’s the more meaningful number as far as Nintendo’s own specifications go.
The Switch's Dock (Image Courtesy iFixit)
Anyhow, that’s enough rambling on background information. Let’s look at the power numbers.
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julian- - Monday, March 6, 2017 - linkInteresting, though I spent an age trying to persuade a Switch to charge from 5V sources with an A-C cable and it refused to pull more than 0.5A from any of them. Were all your tests with Type-C chargers/power banks and C-C cables?
Ryan Smith - Monday, March 6, 2017 - linkYes, they were are C-to-C.
julian- - Tuesday, March 7, 2017 - linkAh, might want to clarify that on page 2, as the following paragraph was definitely not true when I tried with an A-C cable from a good (2.4A) Anker power bank (and even the Switch's own dock).
"what I’ve found is that any good power bank designed to power tablets will be sufficient to power the Switch. So long as a bank can deliver 5V @ 2A or better, then it can power Nintendo’s console."
Also, while the battery itself isn't so badly designed that he recommended they stop selling it immediately because it's dangerous (unlike the wall charger it comes with..), USB-PD guru Nathan K isn't so hot on your recommendation:
Visual - Tuesday, March 7, 2017 - linkwow, so people care about power use for such a device? it seems absolutely irrelevant to me.
how about an actual review, showing what this gadget can run and how well?
whowantscake - Tuesday, March 7, 2017 - linkPeople care, because you want to know what chargers are compatible with the Switch. You want to know which chargers communicate with the Switch and provide more amps than just a trickle. This article also shows that the 5V profile appears to be not fully utilized, so chargers that have a 9V or 15V are able to provide up to the Switch's limit.
What is irrelevant to you is relevant to plenty of Switch owners. We want chargers and battery packs that can provide enough juice to charge while playing undocked, not just slow down the battery drain. This article will help a lot of people buy the most appropriate chargers and battery packs. Helping everyone people advance their understanding of USB-C in general, is great.
Chidoro - Monday, January 8, 2018 - linkHave you provided Anand with your list of what is important to you yet? I’m sure the side doesn’t want to encounter any additional missteps
whowantscake - Tuesday, March 7, 2017 - linkThe article tested numbers were very similar to this reddit user's quick tests (link below). He pulled ~16.5W in-line from the Nintendo AC adapter. He pulled 18W from the Google Pixel charger, which was great news to me, as I've got several already. I highly recommend it to anyone reading comments here. It packs small, and comes with a 6' cord, and the cord & charger have passed rigid usb-c spec testing.
Knowing the 9V profile can provide the maximum 18W means I'll be making sure that the batter charging pack I pick covers it. It'll be a bonus that I can also recharge the Pixel XL at the full rate.
Thanks for the article. It's great having someone putting out good information with the testing method spelled out. Maybe, just maybe, it'll help /r/nintendoswitch to stop passing around poor information and recommendations for chargers and battery packs. USB-C has been a nightmare for consumers to understand.
dchengster - Tuesday, March 7, 2017 - linkGreat work delving into this. As I read your article I thought of my Dell Laptop Power Supply as well as Dell's Laptop Powerbank which outputs in both 5V USB and has a special connector to output in 19.5V. A quick search led me to Dell's 7.4mm Barrel to USB-C adapter on the Dell site. Spec's say it supports 5V/20V, I'll be ordering one to test.. anything to save from packing more power adapters or powerbanks.
dchengster - Tuesday, March 7, 2017 - linkA 4.5mm power connector to USB-C version is also available:
sonicmerlin - Tuesday, March 7, 2017 - linkI want a Switch but the idea of 3 of hours battery life is pretty disappointing, Hopefully a node shrink in a Switch "Pro" version in a year or two will increase battery life.