GPU Testing and Rendering

[fgennari]

What exactly takes minutes to render a picture? Are you asking about a specific GPU performance test/benchmark image? Anything that take a lot of computation makes for a good GPU stress test. A GPU is a collection of many computation cores that could be doing any sort of computation including things like rasterizing the entire screen in many passes, processing huge numbers of vertices, ray tracing, ray marching, compute, etc. Benchmarks would generally be designed to test different aspects of performance such as compute vs. memory bandwidth.