Bottleneck Calculator
Pair a CPU and GPU, pick your resolution, and see which part limits gaming performance — and exactly what to do about it. Every result is driven by BlueprintPC’s own performance index, the same engine behind the build planner.
How the estimate works
We compare a gaming-calibrated single-core score for your CPU against the performance index for your GPU, then adjust for resolution. At 1080p the processor carries more of the work, so a weaker CPU shows up quickly; at 1440p and 4K the GPU does far more per frame, so the same pairing looks more balanced. The percentage is the size of the imbalance, not a measured frame-rate loss — treat it as guidance for where your upgrade money goes, then confirm the full build in the Builder, which also checks socket, RAM, PSU, and clearance compatibility.
For gaming, a GPU bottleneck is the goal — it means the graphics card, the part that matters most for frame rates, is working at full tilt. A CPU bottleneck is the one worth fixing, and it eases as you raise resolution. See the full scoring methodology in the FAQ.
Frequently asked questions
What is a CPU/GPU bottleneck?
A bottleneck is when one component holds another back. If your GPU is far stronger than your CPU, the processor can’t send frames fast enough and the GPU sits partly idle (a CPU bottleneck). If the CPU vastly outclasses the GPU, the graphics card becomes the limit (a GPU bottleneck) — which is normal and desirable for gaming.
How does this bottleneck calculator work?
It compares BlueprintPC’s performance index for your CPU (a gaming-calibrated single-core score) against the index for your GPU, adjusted for your target resolution. At 1080p the CPU matters more; at 4K the GPU does far more work per frame, so a given CPU is much less likely to be the limit. The result is an estimate, not a measured frame-rate figure.
Is some bottleneck normal?
Yes. No pairing is perfectly balanced, and for gaming you actually want the GPU to be the limiting factor — that means you’re getting full value from your graphics card. A small imbalance (under ~6%) is effectively balanced and nothing to worry about.
Does resolution change the bottleneck?
Significantly. The same CPU + GPU pair can show a CPU bottleneck at 1080p and be perfectly balanced at 4K, because higher resolutions shift the workload onto the GPU. Always check at the resolution you actually play at.