A PC bottleneck occurs when one component (usually the CPU or GPU) limits the performance of the other. For example, if your CPU is too slow to keep up with your GPU, the GPU will sit idle waiting for data, reducing your overall frame rate. A balanced system has both components working near their full potential.

Use our free bottleneck calculator: select your CPU, GPU, and gaming resolution. The tool compares their performance scores weighted by resolution (1080p is more CPU-dependent, 4K is more GPU-dependent) and tells you which component is the limiting factor and by how much.

Yes, significantly. At 1080p, the CPU handles about 60% of the workload, making CPU bottlenecks more common. At 4K, the GPU handles about 80% of the work, so GPU bottlenecks are more likely. The same CPU-GPU pair can be balanced at one resolution and bottlenecked at another.

A bottleneck under 10% is generally considered balanced and not worth worrying about. Between 10-25% you may notice some performance loss but it is usually acceptable. Over 25% means one component is significantly holding the other back and an upgrade would make a noticeable difference.

Upgrade whichever component is the bottleneck. If the calculator shows a CPU bottleneck, upgrading your CPU will help most. If it shows a GPU bottleneck, a better GPU will give you the biggest improvement. Sometimes changing resolution (e.g. moving from 1080p to 1440p) can also rebalance the workload.