A GPU bottleneck means the graphics card finishes its frames last, so it sets the frame rate. It is not a fault; some part always sets the ceiling.
- The settings that move the GPU's load most are resolution, render scale and upscaling, and the heaviest effects: shadows, ray tracing and volumetric effects.
- On a laptop, check first that it is plugged in, in its performance mode, and running the game on the dedicated GPU rather than the integrated one.
- Measure again after each change. A change that does not move the figure was not the limit.
The short answer
If the graphics card is the limit, give it less to draw per frame or let it draw at full power. Lower the resolution or the render scale, turn on the game's upscaler, step down the heaviest effects, and make sure the machine is plugged in and set to its performance mode. Change one thing at a time and measure again, so you know which change paid.
Confirm the GPU is the limit first
The quickest check is resolution: if lowering it raises the frame rate, the GPU was the limit; if the frame rate does not move, the processor or something else is. SystemCheck's report shows the CPU and graphics stages side by side, so you can see which one has less headroom on this machine, and the bottleneck test page explains how to read the pair.
What to change, in order
Start with the changes that remove the most work for the least loss in picture.
- Resolution and render scale: fewer pixels per frame is the largest single cut. An upscaler renders fewer pixels and fills in the rest.
- The heaviest effects: ray tracing, shadow quality, volumetric fog and screen-space reflections usually cost more than texture quality.
- A frame cap at or just under the display's refresh rate: the GPU stops drawing frames the screen cannot show, which also cuts heat.
- Drivers: install the graphics driver from the GPU maker or the laptop maker. Note the version, so a later run can be compared fairly.
Laptops: is the GPU getting its power?
A laptop GPU runs at a power level the maker sets, and that level usually changes with the power source and the power mode. On battery, or in a quiet or balanced mode, the same chip can deliver much less. On a laptop with two GPUs, the operating system's graphics settings choose which one runs each program; a game left on the integrated GPU will look like a weak graphics card.
If the graphics stage falls after it settles, that shape is consistent with heat or a power limit, among other causes. A browser cannot read either; a sensor tool such as HWiNFO confirms which one it is. Clean vents and a hard, flat surface are the first things to try.
Terms used here
Questions
- Is a GPU bottleneck bad?
- No. In a game, the GPU being the limit is the usual and expected case, because the processor is rarely asked to do as much per frame. It only matters if the frame rate is lower than you want.
- Will a faster processor fix a GPU bottleneck?
- No. If the graphics card finishes last, a faster processor makes it wait longer. Lower the GPU's load or upgrade the GPU.