Best Gpu For Rendering
The scene file, meshes, lighting, shaders, and render settings remain constant throughout the testing. When comparing CPU rendering to GPU rendering, benchmarking becomes more complex. Plautus plays. For example, Chaos Group’s V-Ray has a popular GPU rendering engine (V-Ray RT for GPUs).
Gpu Render Engines
If a laptop's brain is the CPU, then consider the GPU the occipital lobe. 
Responsible for rendering images, video and animations in either 2D or 3D for the display, the chip performs rapid mathematical computations, freeing up the processor for other tasks. Where a CPU consists of a few cores focused on sequential serial processing, GPUs pack thousands of smaller cores designed for multitasking. While your Intel Core i7 CPU can render graphics, it'll do so at a much slower rate than a GPU. In fact, GPUs have so much power that some programs tap them into service to help out the CPU on non-graphics tasks, which drastically increases speed and performance.