Otoy is running a competition so at this time you can trial octane render and try to win this competition
From the website
What is OctaneRender?
OctaneRender is the world’s first and fastest GPU-accelerated, unbiased, physically correct renderer. What does that mean? It means that Octane uses the graphics card in your computer to render photo-realistic images super fast. With Octane’s parallel compute capabilities, you can create stunning works in a fraction of the time.
Use OctaneRender to create images of the highest possible quality at speeds up to 50x faster than CPU-based, unbiased renderers. Attached to your editing tools? No problem! Octane supports more than 21 plugins and has a fully interactive, real-time 3D editing viewport.