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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p-zilla - Monday, March 6, 2017 - linkNo, what this means is that they charged to 100%, started playing games and measured the draw from the wall.. What this means is that the switch is pulling approximately 4 watts from the battery and 11 from the wall at 100% battery life. Which matches what people have seen. The switch actually pulls from the battery down to 88% while docked and gaming. The only way to get a full charge is to put it to sleep and dock it. You'll never have a full charge with it on and docked.
tipoo - Monday, March 6, 2017 - linkAh, ok.
uberfish - Saturday, May 6, 2017 - linkThat's awesome news. It shows Nintendo really did a great job when designing the console to maximize battery life. Keeping the battery at a lower state of charge during the time when the console is going to be running hot will really help the longevity of the cells.
Ryan Smith - Monday, March 6, 2017 - linkIdle numbers weren't collected. Since it's a portable game console, it's only the load numbers that have any significance. (You can't do anything with the console but sleep and play games)
bubblyboo - Monday, March 6, 2017 - linkThe Tegra X1 was never really a "mobile" chip, as Nvidia only designated it for their Shield TV.
Those A57 procs are also old and outdated at this point. Sure it's a huge jump as opposed to what Nintendo usually does, but they probably just went with the X1 to save money. Additionally, using a 16Whr battery while the undocked Switch uses 7W-9W is really pushing that supposed 2.5-6.5 hours of use. Would be nice to see how much power it uses with an indie/mobile game that wouldn't push the Switch as much.
tipoo - Monday, March 6, 2017 - link
Yeah, shame about staying on 20nm as that limits it to A57 and Maxwell, unless they wanted to port older architectures to a new node. 16nm would be much more efficient, as well as already have A72 and Pascal taped out for it.
BrokenCrayons - Monday, March 6, 2017 - linkI vaguely recall seeing a battery life rating of 2-6 hours in the Nintendo eShop on my 2DS a couple of days ago when I was browsing for games. Honestly, that's a really big range and I'd hate to be on the lower end of that scale. It's already bad enough playing on a Vita Slim. I usually end up a lot closer to 4 hours than Sony's claim of up to 6 hours. If the Switch is worse than the Vita Slim, then it'd be annoying as a mobile gaming platform regardless of the improvements in graphics.
That said, I'm pretty interested in getting a Switch despite the battery life...though I'd like to hold off for a revised, maybe second generation model that lasts a couple hours longer on battery and possibly doesn't need active cooling. If that ever happens, I'd happily order one.
Anyway, thanks for tinkering with the Switch, Ryan!
skiboysteve - Monday, March 6, 2017 - linkWould be interesting to see a power bank that is capable of 15V output with the switch like the razer one: https://www.razerzone.com/gaming-accessories/razer...
eriri-el - Monday, March 6, 2017 - linkAll u need is a quick google search: https://www.ravpower.com/26800mah-Type-C-external-...
Ryan Smith - Monday, March 6, 2017 - linkGood find. Thanks!
I had been searching over the weekend but that one never came up. Glad to see someone is finally shipping a power bank with higher voltage modes.