New for GTX 800M: Battery Boost

While the core hardware features have not changed in most respects – Maxwell and Kepler are both DX11 parts that implement some but not all of the DX 11.1 features – there is one exception. NVIDIA has apparently modified the hardware in the new GTX 800M chips to support a feature they’re calling Battery Boost. The short summary is that with this new combination of software and hardware features, laptops should be able to provide decent (>30 FPS) gaming performance while delivering 50-100% more battery life during gaming.

This could be really important for laptop gaming, as many people have moved to tablets and smartphones simply because a laptop doesn’t last long enough off AC power to warrant consideration. Battery Boost isn’t going to suddenly solve the problem of a high-end GPU and CPU using a significant amount of power, but instead of one hour (or less) of gaming we could actually be looking at a reasonable 2+ hours. Regardless, NVIDIA is quite excited to see where things go with Battery Boost, and we’ll certainly be testing the first GTX 800M laptops to provide some of our own measurements. Let’s get into some of the details of the implementation.

First, Battery Boost will require the use of NVIDIA’s GeForce Experience (GFE) software. You can see the various settings in the above gallery, though the screenshots are provided by NVIDIA so we have not yet been able to test this. Battery Boost builds on some of the already existing features like game profiles and optimizations, but it adds in some additional tweaks. Each GFE game profile on a laptop with Battery Boost will now have options for plugged in and battery power settings, and along with that setting is the ability to set a target frame rate (with 30 being commonly recommended as a nice balance between smoothness and reducing power use).

NVIDIA went into quite a bit of detail explaining how Battery Boost is more than simply targeting a lower average frame rate. That’s certainly a large part of the power savings, but it’s more than just capping the frame rate at 30 FPS. NVIDIA provided some information with a test laptop running Borderlands 2 where the baseline measurement was 86 minutes of battery life; turning on frame rate targeting at 30 FPS improved battery life by around 25% to 107 minutes, while Battery Boost is able to further improve on that result by another 22% and deliver 131 minutes of gameplay.

NVIDIA didn’t reveal all the details of what they’re doing, but they did state that Battery Boost absolutely requires a new 800M GPU – that’s it’s not a purely software driven solution. It’s an “intelligent” solution that has the drivers monitoring all aspects of the system – CPU, GPU, RAM, etc. – to reduce power draw and reach maximum efficiency. I suspect some of the “secret sauce” comes by way of capping CPU clocks, since most games generally don’t need the CPU running at maximum Turbo Boost to deliver decent frame rates, but what else might be going on is difficult to say. It also sounds as though Battery Boost requires certain features in the laptop firmware to work, which again would limit the feature to new notebooks.

Besides being system wide and intelligent, NVIDIA has two other “talking points” for Battery Boost. It will be automatic – unplug and the Battery Boost settings are enabled; plug in and you switch back to the AC performance mode. That’s easy enough to understand, but there’s a catch: you can’t have a game running and have it switch settings on-the-fly. That’s not really surprising, considering many games require you to exit and restart if you want to change certain settings. Basically, if you’re going to be playing a game while unplugged and you want the benefits of Battery Boost to be active, you’ll need to unplug before starting the game.

As for being user tunable, the above gallery already more or less covers that point – you can customize the settings for each game within GFE. I did comment to NVIDIA that it would be good to add target frame rate to the list of customization options on a per-game basis, as there are some games where you might want a slightly higher frame rate and others where lower frame rates would be perfectly adequate. NVIDIA indicated this would be something they can add at a later date, but for now the target frame rate is a global setting, so you’ll need to manually change it if you want a higher or lower frame rate for a specific game – and understand of course that higher frame rates will generally increase the load on the GPU and thus reduce battery life.

There’s one other aspect to mobile gaming that’s worth a quick note. Most high-end gaming laptops prior to now have throttled the GPU clocks when unplugged. This wasn’t absolutely necessary but was a conscious design decision. In order to maintain higher clocks, the battery and power circuitry would need to be designed to deliver sufficient power, and this often wasn’t considered practical or important. Even with a 90Wh battery, the combination of a GTX-class GPU and a fast CPU could easily drain the battery in under 30 minutes if allowed to run at full performance. So the electrical design power (EDP) of most gaming notebooks until now has capped GPU performance while unplugged, and even then battery life while gaming has typically been less than an hour. Now with Battery Boost, NVIDIA has been working with the laptop OEMs to ensure that the EDP of the battery subsystem will be capable of meeting the needs of the GPU.

Your personal opinion of Battery Boost and whether or not it’s useful will largely depend on what you do with your laptop. Presumably the main reason for getting a laptop instead of a desktop is the ability to be mobile and move around the house or take your PC with you, and Battery Boost should help improve the mobility aspect for gaming. If you rarely/never game while unplugged, it won’t necessarily help in any way but then it won’t hurt either. I suspect many of us simply don’t bother trying to game while unplugged because it drains the battery so quickly, and potentially doubling your mobile gaming time will certainly help in that respect. It’s a “chicken and egg” scenario, where people don’t game because it’s not viable and there’s not much focus on improving mobile gaming because people don’t play while unplugged. NVIDIA is hoping by taking the first step to improving mobile battery life that they can change what people expect from gaming laptops going forward.

Introducing NVIDIA’s GeForce 800M Lineup for Laptops Other Features: GameStream, ShadowPlay, Optimus, etc.
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  • Freakie - Wednesday, March 12, 2014 - link

    Not only in time for back-to-school, but in time for Broadwell. The power improvements of Broadwell + Maxwell at the very high end will be an incredibly refreshing change in gaming-laptop battery life. Reply
  • willis936 - Wednesday, March 12, 2014 - link

    What's the timeframe for laptops showing up with these? A P34G with a GTX 860M (and hopefully a 16GB option) would be great before summer. Reply
  • bakedpatato - Wednesday, March 12, 2014 - link

    Couple of outlets are running pieces on the "New Razer Blade 14", it has a 3200 x 1800 touch screen and indeed does have a 870m while the Blade Pro indeed has a 860m Reply
  • jasonelmore - Wednesday, March 12, 2014 - link

    wtf the pro has a less powerful GPU in a much bigger chassis? Reply
  • jcompagner - Wednesday, March 12, 2014 - link

    So now we will get a many nice and light and thin 17" laptops?

    Currently the only 1 i can by in The Netherlands is the MSI Stealth. I don't know any other. So i guess i just have to wait until the refresh of the Stealth (that i guess will have a 8xxM in side it)

    But it would be nice to have way more options.. (for example a 17" with a resolution between 2k and 4k)
    Reply
  • Aikouka - Wednesday, March 12, 2014 - link

    Hm, I think the only disappointing factors are the use of Kepler and Maxwell parts (although not surprising) and the lack of distinguishing between the two architectures at the 860M level. However, I am looking forward to coverage of 860M (Maxwell) parts as I think that will finally be a good sweet spot for me. I have an aging gaming laptop (Dell M1530 with an M8600 GT), and I've grown very used to my ASUS Zenbook... especially its weight (or the lack thereof). So, I'm hoping for a (relatively!) light-weight laptop that has some decent gaming power under the hood. Reply
  • willis936 - Wednesday, March 12, 2014 - link

    Kepler? How about that Fermi SKU? They have to be blowing the dust off of some old chips to still be selling those. Really the most disappointing thing about the 800 series so far is the fact that there still is no word on desktop parts. As most people are saying they're likely waiting for TSMC 20nm. That is a long gap. The entire desktop gaming GPU cycle has been shifted half a year because of it. I can't imagine nvidia and amd expect to get "back on track" by releasing the 900 series parts a few months after the 800 series. Reply
  • schizoide - Wednesday, March 12, 2014 - link

    The 750Ti (and thus 860m) still doesn't match the 7870/660 class GPUs in current-gen consoles and thus isn't a really viable enthusiast gaming platform. The

    870m is a closer fit, and the 880m definitely does it, but those will be much more expensive. We're so dang close to xbone/PS4-class performance in mainstream laptops, it hurts.
    Reply
  • JarredWalton - Wednesday, March 12, 2014 - link

    You can't just look at the CUDA core counts -- the consoles are using AMD chips for one, and AMD shader cores have almost always been "slower" individually than NVIDIA shader cores. I suspect the GTX 750 Ti will give the PS4 and XBOne a run for the money in GPU performance. Couple it with a decent CPU and the only thing really holding us back on PCs is the OS and the need to support "infinity" different hardware configurations. Reply
  • schizoide - Wednesday, March 12, 2014 - link

    I'm not looking at core counts alone, all the various game tests have shown the 750Ti to be slower than the 7870 and the 660, which are roughly equivalent to current-gen consoles. Reply

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