FPS Bottleneck Calculator

About this calculator

A frame rate bottleneck occurs when one component — CPU or GPU — caps the frames per second the other could otherwise deliver, since the pipeline runs at the speed of its slowest stage. This calculator takes the FPS your CPU can sustain (limited by draw calls, physics, AI and game logic per frame) and the FPS your GPU can sustain (limited by shading, rasterization and resolution), then reports the effective FPS as the lower of the two and the percentage gap between them.

PC gamers, hardware reviewers and system builders use bottleneck estimates like this to decide whether upgrading a graphics card will actually raise frame rates or whether the CPU is the real ceiling — a common question when pairing an older CPU with a new GPU, or when running at 1080p versus 4K shifts the bottleneck from CPU-bound to GPU-bound. It's also the same underlying logic tools like MSI Afterburner's frametime graphs are used to diagnose in practice.