Bottleneck Calculator
Free bottleneck calculator. Pick your CPU and GPU to see the bottleneck percentage, estimated FPS and 1% lows, plus what to upgrade first.
How the bottleneck calculator works
A bottleneck is simply the component that runs out of headroom first. We estimate two separate frame rates — the fps your CPU could sustain and the fps your GPU could sustain for the same scene — and your actual frame rate is whichever is lower. The gap between the two, expressed as a percentage of the higher figure, is the bottleneck.
bottleneck % = (faster limit − slower limit) ÷ faster limit × 100
The CPU estimate scales with its benchmark score and memory speed. The GPU estimate scales with its score divided by scene demand, which comes from your resolution, quality preset and the type of game. This is why the same pair of parts can be CPU-limited at 1080p and GPU-limited at 4K: raising the resolution adds work for the graphics card while the processor's job barely changes.
What counts as a problem
- Under 12% — balanced. Nothing to fix.
- 12–30% — minor. Normal in most real builds and rarely worth spending on.
- 30–60% — moderate. You are leaving noticeable performance unused.
- Over 60% — severe. One component is badly mismatched to the other.
A bottleneck is not automatically bad
Every system is limited by something. If you play at 4K with a high-end graphics card, being GPU-limited is exactly what you want — it means you are getting full value from the most expensive part in the build. A CPU bottleneck at high resolution is the situation worth investigating, because it caps your frame rate no matter which card you install.
Why 1% lows matter more than averages
The 1% low figure is the frame rate during the worst 1% of frames — the stutters you actually feel. A large CPU bottleneck tends to hurt 1% lows more than the average, which is why a system can show a high average frame rate and still feel uneven. Insufficient RAM and slow memory affect this figure too.
What to do about it
If the CPU is the limit, faster memory or a processor with stronger single-thread performance helps most; the Upgrade Advisor finds the cheapest meaningful step. If the GPU is the limit, raise the resolution or quality to get more visual quality for frames you were not using, or move to a faster card — compare options with the GPU Comparison tool. Check the resulting power draw with the PSU Calculator before buying.
Frequently asked questions
What is an acceptable bottleneck percentage?
Anything under about 12% is balanced, and up to 30% is normal in real builds. Only above 30% is it usually worth spending money to correct, and even then only if the limiting component is the one you can most cheaply improve.
Does a CPU bottleneck damage my hardware?
No. A bottleneck simply means one part waits on another. There is no extra wear, heat or risk involved - you are just not getting the full performance you paid for.
Why does my bottleneck change with resolution?
Raising the resolution multiplies the work the graphics card does while leaving the processor's workload roughly unchanged. A pairing that is CPU-limited at 1080p often becomes GPU-limited at 1440p or 4K.
Will more RAM fix a bottleneck?
Only if you are short of capacity. Going from 8 GB to 16 GB removes stutter caused by swapping; going from 16 GB to 32 GB rarely raises frame rates in games. Faster memory, however, does help CPU-limited scenarios, especially on Ryzen.
How accurate are these estimates?
They are modelled from normalised benchmark scores and calibrated against real testing, so they are reliable for comparing configurations and planning upgrades. Treat exact frame numbers as guidance - drivers, cooling, game patches and individual silicon all shift real results.
Should I upgrade my CPU or my GPU first?
Upgrade whichever the calculator identifies as the limiting component at the resolution you actually play at. Upgrading the other one will change almost nothing until the bottleneck is addressed.