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.
Post Your CommentPlease log in or sign up to comment.
View All Comments
Yaldabaoth - Monday, March 6, 2017 - link"The Spanish Inquisition has _5_ preferred voltages! 5V, 9V, 15V, and 20V! [...] WAIT!"
jhoff80 - Monday, March 6, 2017 - link12V. Which is now optional in USB-PD 2.0.
DanNeely - Monday, March 6, 2017 - linkdoes anyone know why it was deprecated in favor of 9 and 15V (which weren't in the 1.0 version of the spec)?
jhoff80 - Monday, March 6, 2017 - linkMy understanding is that 15V was put in because of Apple, who had been using 14.5V for the MacBook USB-C charger. And if I had to guess, I'd say that 9V probably came into play for phones (such as the Google Pixel) where 12V or 15V would be overkill, but manufacturers wanted faster than 5V 3A charging. But just speculation on my part.
metayoshi - Monday, March 6, 2017 - linkYeah, Qualcomm uses 9V for Quickcharge (at least for the AC adapter for my GS7 edge), so I assume that they influenced the inclusion of the 9V option for USB-PD.
acfoltzer - Monday, March 6, 2017 - linkThis is a really helpful article, thanks! I was puzzled by what seemed like an absurdly high rating on the included AC adapter—I was worried it'd be impossible to find a travel adapter that would be sufficient. It sounds like a good 5V@3A adapter will do in a pinch, though, and those are easy enough to come by.
Shadowmaster625 - Monday, March 6, 2017 - linkCan you measure power cosumption while Zelda is paused? It's still doing stuff even within the various pause screens, but I would think that the SoC would clock itself lower.
zodiacfml - Monday, March 6, 2017 - linkGood one. I'm interested in this kind of power and charging articles.
For the Switch, I feel that it is pretty redundant for a battery charging a another battery. It is fine if it can't charge the battery well while it is being used.
My smartphone lives with PC USB charging only so it may sometimes consume more power and draw from the internal battery while connected and is in use..
sircod - Monday, March 6, 2017 - linkWere you ever able to pull more than 10W through a 3rd party adaptor (like the 17.7W you got through the official)?
Ryan Smith - Monday, March 6, 2017 - linkYes. While it's not listed here, the Apple adapter provided more than 10W when the Switch was running.