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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  • Connoisseur - Wednesday, March 12, 2014 - link

    Jarred. In regards to the ultra high-res displays, have you already or do you plan on putting together an article regarding gaming and upscaling on 3K and 4K screens? More and more laptops are coming out with these "retina" style displays where the graphics card won't be able to run games at native res. I'd like to see how the games would look/perform with upscaling. For example, running the game at 16x9 or 1080p with various settings on a 3k screen.

    I think it'd be an important article because it would affect my buying choice when offered multiple screen options with the same laptop.
  • JarredWalton - Wednesday, March 12, 2014 - link

    I commented on this in the Dell XPS 15 review. Basically, upscaling (or running at non-native) is much less noticeable in many respects as the pixels are so small. The other side of the coin is that there are way too many Windows apps that I use that don't work well with high DPI. In a few years, I think it will all get sorted out, but right now high DPI is "bleeding edge" stuff.
  • rxzlmn - Thursday, March 13, 2014 - link

    4K is much better than 3K though, due to the fact that you can natively scale to both 720p and 1080p.
  • Dustin Sklavos - Wednesday, March 12, 2014 - link

    I wonder if Vivek had a hand in that. ;)
  • JarredWalton - Wednesday, March 12, 2014 - link

    Possibly, but I thought he was primarily concerned with making the chassis and waxing eloquent on the joys of the material choices and such. Speaking of which, what are you working on these days? Hahaha....
  • WinterCharm - Wednesday, March 12, 2014 - link

    Just checked out Razer's website...

    That blade has an IGZO (Indium Gallium Zinc Oxide) IPS touchscreen, at a resolution of 3200x1800.

    Looks like you're in luck! :) just... uh... prepare your wallet.
  • Connoisseur - Thursday, March 13, 2014 - link

    Wallet is never prepared. I just club it on the head and drag it out. This will be one hell of an expensive purchase if I end up buying it. I'm really curious about the heat and noise generated by this beast. Looks like it's shipping in April? I'm hoping AT gets a review sample.
  • talos113 - Wednesday, March 12, 2014 - link

    This is great news! I look forward to seeing laptops become thinner and more powerful. I know they will never fully reach desktop performance, but it makes me smile seeing them gain. I recently purchased a sager np9150 with a 7970m and I am honestly using my desktop less and less while I enjoy the benefits of mobility. Its an awesome time for technology!
  • warezme - Wednesday, March 12, 2014 - link

    I'm still rocking a big Alienware 17x R3 with 580M so I have been eyeing the upgrade paths. But, I can't help but be very disappointed the "880M" is not Maxwell technology but just re-branded old stuff. I don't care if its 20% faster. I don't mind a carrying around a large laptop. I'm not a frail girl.
  • JarredWalton - Wednesday, March 12, 2014 - link

    My guess is we'll see Maxwell GTX 890M or 885M or something during the summer months -- just in time for the back-to-school shopping.

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