PC Bottleneck Calculator
Check if your CPU is holding back your GPU. Free, no signup
2 followers
Check if your CPU is holding back your GPU. Free, no signup
2 followers
Pick your CPU and GPU, get an honest verdict: which part is the limit, at 1080p / 1440p / 4K, with expected FPS in real games and what to upgrade first. Built on real benchmark data with a published 21.6% mean absolute error — most bottleneck calculators won't tell you their error rate, which tells you something. Free, no signup. There's also an embeddable version for blogs — that one carries no ads at all — and a data study of all 2,808 CPU+GPU pairings.
Hi PH! I'm Salman, a solo dev from Karachi.
I built this because every bottleneck calculator I found was either a content farm with a fake progress bar, or gave one answer regardless of resolution — which is technically impossible, since the same CPU+GPU pair that bottlenecks at 1080p is usually fine at 4K.
So I built one on actual benchmark data (PassMark, TechPowerUp) and did the thing none of them do: published the error rate. The engine's FPS predictions run 21.6% mean absolute error against measured benchmarks, 72% within ±35%. When it's uncertain, it says so.
A few things I'm proud of:
• Verdicts at all three resolutions, because resolution flips the answer
• A data study across all 2,808 pairings — spoiler: at 4K only 9% of combos are CPU-bound
• The published error rate, which is the part I'd want to see from anyone else
• Free embeddable widget if you run a hardware site — that one carries no ads at all
Ask me anything about the engine — the normalization, the FPS model, or why "GPU-bound" is what you actually want.
[Edited 14 Sep 2026] This originally said "the calculator itself will never show ads." That is no longer true — the site now runs AdSense, including on the calculator. Correcting it here rather than quietly dropping the line. The embeddable widget is still completely ad-free, and that part is not changing.