The GPU render mode is a limited feature set and it puts you in the awkward spot of figuring out what you really need. According to some estimates GPU render engines are 50 to 100 times faster than conventional CPU renderers. Cpu Vs Gpu Rendering Which Is Best For Your Studio Projects Render Pool Cloud Based Gpu Rendering V-Ray has a higher level of sophistication in that it can compute rendering in CPU and GPU setups. . The GPU rendering is using slightly different algorithms as GPUs perform best with uniform parallel workloads. A GPUs architecture and its thousands of CUDA Stream-processing cores are purpose-made for parallel processing and easily outperform a CPU. This does mean that the GPU algorithms converge more slowly to a noise-free image than the CPU algorithms. There are only a small set of features thats not supported on the GPU the biggest missing feature being Open Shading Language. LuxRender is OpenCL based ...