At the desk, on the charger that came in the box, the laptop does roughly what the reviews said. On battery, on a smaller charger or on the sofa, the same game runs noticeably worse. Or it runs badly everywhere, and the graphics chip you paid for barely seems to wake up.
A gaming laptop runs under limits that move with its situation: the power source, the charger, the modes Windows and the maker's app are in, heat, and which of its two graphics processors draws the game. None of the sources below says how often each one is the cause, so check each in turn.
On battery, the limits are lower on purpose
Dell's support article for one model, the G15 5530, lists the conditions in unusual detail. The graphics chip is held to 30 W when the laptop "is using battery, and the power mode settings are set to optimize battery life", in a thermal mode that limits the fan "such as Quiet Mode", when it "is not on a solid frame", when the venting is abnormal, and under heavy load in surroundings at or beyond its maximum operating temperature. The reason: "to ensure that the computer does not overheat". The 30 W figure belongs to that model; the list of triggers is what to check on yours.
NVIDIA BatteryBoost
NVIDIA laptops add a separate limit. NVIDIA describes BatteryBoost as "completely automatic, turning on the second you fire up a game when you're unplugged", with a target frame rate you can adjust. The cap is how it saves power: in ASUS's words, a lower frame rate lets the GPU and CPU run "at a much lower wattage, drawing less power from the battery".
NVIDIA's page speaks of a "30+ FPS experience" but states no default target. ASUS wrote in 2023 that BatteryBoost is on by default on its ROG laptops when unplugged, and that in its testing BatteryBoost 2.0 "capped framerates to 30 FPS". Treat 30 as what ASUS saw, not an NVIDIA setting. A game that sits on one flat frame rate on battery, and nowhere else, points here.
ASUS's guide switched BatteryBoost off in GeForce Experience. NVIDIA's release notes for NVIDIA app 11.0.5.266 list BatteryBoost and WhisperMode among the "key notebook settings", so those are the names to look for in NVIDIA's software. Two details matter:
- The lowest cap wins. NVIDIA's 2022 support article on Max Frame Rate says that when Battery Boost or Whisper Mode is on alongside a Max Frame Rate limit, the frame rate is capped "to the lowest of the limits".
- WhisperMode trades power for quiet. NVIDIA says that with it "power usage plummets" and the fans slow down. ASUS lists turning it off next to resetting the Windows power plan settings to default.
Switching BatteryBoost off removes a cap, not the power mode Windows uses on battery.
Windows power mode: one for each power source
Microsoft's instructions put it in Settings > System > Power & battery, under Power mode, with separate choices for plugged in and on battery: Best power efficiency, Balanced or Best performance. A laptop can be on Best performance at the desk and on Best power efficiency the moment the cable comes out.
If the mode cannot be changed, Microsoft says "a custom power plan might be selected" and points to Control Panel > System and Security > Power Options, then Balanced. Microsoft's guidance for PC makers says the power mode slider appears only while Balanced, or a plan derived from Balanced, is selected, and that the maker can configure what each mode engages. w0a's Power plan and battery card activates Balanced, deletes the plans w0a itself created and puts power-saving settings back to the Windows defaults.
The maker's own modes
The maker's control app adds profiles on top of Windows. Dell lists a fan-limiting thermal mode among the triggers for its GPU limit; ASUS tells owners to check that the GPU mode is "Standard (not Eco Mode)" and that the machine is in its performance mode. The names differ between makers. The questions do not: is a quiet or battery-saving profile active, and is the discrete GPU allowed to run?
The charger: wattage and USB-C
Dell lists what a lower-wattage adapter can cause: the battery "continues to drain when the computer is connected to AC power", charges slowly or not at all, and "The computers performance is slower than expected". Its checklist: the correct wattage for the computer, and an adapter that is "USB PD Compliant".
On USB-C, Windows warns you. Microsoft's USB-C troubleshooting page names the Slow charger and PC isn't charging notifications and lists the causes: a charger that "isn't powerful enough", a cable that "isn't powerful enough for the charger or PC", or a charger "connected through an external hub or dock". It advises using the charger and cable that came with the device.
One case is by design. Dell says some of its gaming laptops use Hybrid Power Mode: when the laptop needs more than the adapter can supply, it "starts consuming the battery power without sacrificing performance". There, a battery that falls during a long session on the charger is not a fault.
Two GPUs: which one draws the game
A laptop with both integrated graphics and a separate GPU is what Microsoft calls a hybrid system: the integrated GPU outputs to the built-in panel, the discrete GPU "is a render-only device" with no display outputs connected to it, and "the operating system and driver together determine which GPU an application should run on". Microsoft's driver documentation describes the path: the discrete GPU copies each finished frame into a resource it shares with the integrated GPU, whose side composes and shows it.
Some laptops add a switch, a multiplexer or mux, that can connect the built-in panel to the discrete GPU directly. Microsoft's driver documentation on automatic display switching says that on such laptops the graphics driver performs that switch "without any OS knowledge". Which chip drives each external port of your model is for its manual or spec sheet to say. Only a before-and-after capture shows whether the frame copy costs anything in your game.
Checking which GPU a game uses
Open Task Manager with Ctrl+Shift+Esc. Microsoft's DirectX team, adding GPU monitoring to it in 2017, described a per-process GPU figure plus a second column naming which GPU and engine it belongs to; in Windows 11 that column is GPU engine. Right-click a column header to add them. Task Manager numbers the GPUs (GPU 0, GPU 1) and uses the same numbers on the Performance page.
If a game runs on the integrated GPU, Windows has a per-game choice. Microsoft's steps: Settings > System > Display > Graphics, select the game under Custom options for apps, then Options; on a PC with more than one GPU, Graphics preference offers Let Windows decide, Power saving and High performance. Save, then restart the game. To undo a "high performance" choice w0a wrote, its Which GPU a game runs on card removes per-game high-performance preferences and lets Windows decide again; a power-saving preference you set yourself in Settings is left alone.
Heat and what the laptop sits on
Dell's list includes abnormal venting, and its fix is a well-ventilated place where "the air vents are not obstructed". The "not on a solid frame" item is a different trigger, explained in a linked Dell article: holding the laptop at an angle, or moving or shaking it, triggers a "Laptop mode" that limits the GPU's power. Dell's fix: keep it at a fixed or horizontal angle and do not move it during use. CPU and GPU temperatures while gaming covers reading the temperatures.
What does not help
- Raising a frame limit while BatteryBoost or WhisperMode is on. The lowest cap wins.
- A custom "high performance" plan to get past a locked power mode. Microsoft names a custom plan as a possible reason the mode cannot be changed; its fix is Balanced.
- Judging by feel. Capture the same scene plugged in and unplugged, change one thing, compare; reading the benchmark covers how.
- A setting for a hardware limit. An underpowered charger or a blocked vent is fixed with an adequate charger or a clear vent.
Related
- Which GPU a game runs on
- Power plan and battery
- Sudden FPS drops in games
- CPU and GPU temperatures while gaming
- Should you cap your FPS?
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