"Stop guessing which part of your PC is holding you back. This guide breaks down exactly how to spot the difference between a CPU and GPU limit."
At its simplest, a bottleneck happens when one component in your PC is waiting for another components to finish its job. Think of it like a kitchen where a world-class chef (the GPU) can cook as fast as possible, but if the prep cook (the CPU) can't chop vegetables fast enough, the chef has to wait.
A CPU Bottleneck means your processor is at 100% load, struggling to keep up with game logic and physics, while your graphics card sits underutilized. A GPU Bottleneck means your graphics card is maxed out trying to draw complex frames, while your CPU is comfortably waiting to send the next set of instructions.
The fastest way to get an estimate is to use a bottleneck calculator. You enter your CPU and GPU models along with your target resolution. High-quality calculators analyze thousands of benchmark results to predict how those two specific parts will handle modern games.
Usually, a result below 10% is considered a "balanced" system where you won't notice any significant performance loss. Above 20%, you're likely leaving a lot of performance on the table, and your PC might feel "lopsided" during heavy tasks.
If you open an overlay like MSI Afterburner or NVIDIA Overlay and see your GPU Usage hovering around 60-80% while your CPU Usage is at 95-100%, you are CPU-bound.
CPU bottlenecks often manifest as "micro-stutter." Even if your average FPS is high, you'll experience sharp, sudden dips as the CPU struggles to process background tasks or physics effects.
This is actually the "ideal" state for most gaming PCs. You want your GPU usage at 98-100%, meaning you are getting every ounce of graphical power you paid for.
If your game feels consistent but the frame rate just isn't high enough, you are limited by the GPU. Increasing resolution (e.g., going from 1080p to 4K) will almost always move the bottleneck toward the GPU.
To fix a CPU bottleneck, try increasing your resolution or global graphics quality. This forces the GPU to work harder, taking the pressure off the CPU. Conversely, to fix a GPU bottleneck, lower your resolution or turn down settings like shadows and ray-tracing.
Don't buy a new GPU if your current one is only being used at 70%. In that case, you need a faster CPU or faster RAM. Our homepage calculator can tell you exactly which part would be the smartest upgrade for your current motherboard.