About BottleneckCalcs

BottleneckCalcs is a free, open tool designed to help PC gamers and builders identify performance bottlenecks in their systems before spending money on upgrades.

Our calculator uses a multi-factor analysis engine that considers CPU gaming performance, GPU performance data, resolution and quality settings, VRAM, memory configuration, and workload type to provide accurate bottleneck predictions.

How We Calculate

For gaming, we simulate 15 popular titles. In each one we estimate the frame rate your CPU could deliver (using a gaming performance index rather than multi-thread scores) and the frame rate your GPU could deliver at your resolution, graphics preset, upscaling and ray-tracing settings, including VRAM limits. Your real FPS is set by the slower of the two, and the gap between them across all games is your bottleneck percentage. A GPU-bound system is treated as healthy, because that is how a balanced gaming PC should behave. For rendering and productivity we compare multi-thread CPU capacity with GPU capacity instead. RAM capacity and speed, memory channels, storage and operating system are applied as separate efficiency modifiers.

Our Database

We maintain a database of 150+ CPUs and 95+ GPUs spanning a decade of hardware from Intel, AMD, and NVIDIA. Performance scores are derived from synthetic benchmarks (3DMark, Cinebench) and real-world gaming tests.

Disclaimer

Bottleneck calculations are estimates based on benchmark data and algorithmic modeling. Real-world performance varies based on game optimization, driver versions, RAM speed, cooling solutions, and other system factors. Use these results as a general guide, not absolute truth.