What is bottleneck ? What we can do. In the context of a PC, a bottleneck refers to a component that limits the potential of other hardware due to differences in the maximum capabilities of the two components. A bottleneck isn’t necessarily caused by the quality or age of components, but rather their performance. Bottlenecks aren’t unique to high-end systems either; balance is equally important in systems with more entry-level hardware. Finding a Compatible CPU and GPU Bottlenecks are not exclusive to the CPU and GPU, but the interplay between these two components illustrates how a bottleneck can impact a system. The central processing unit (CPU) is responsible for calculating operations like physics, audio, netcode, positional data, and countless other systems in modern PC games. It also sends rendering instructions to the graphics processing unit (GPU). These instructions from the CPU contain everything the GPU needs in order to know what to render, including shaders, textures, and o...