Not sure of the heat issues you are having, sounds like a bad hardware setup. Gpu Rendering has come a long way, I know some complain that gpu rendering doesn't support all features, well neither did cpu rendering when it first came out. I remember using some of the first Corona betas, they where missing quite a lot. Gpu rendering is no longer in it's infancy, we can work on full production with GPU now. Even some GPU renderers like Moskito claim to support all features of Max, including all shaders. I have not used that one, but using Octane + Vray RT I can tell you I am not running into any issues on large scenes. There is a reason why all rendering engines are turning to GPU, and I would hate to see a great GPU renderer like Corona miss it's chance. CPU's are gaining no ground it terms of performance, there is a tiny increase each year for tons of money. Now that GPU's have huge amounts of ram and are increasing it speed by incredible rates there is no competition in terms of which platform is really moving forward. I have tested GPU renderers vs Coronas CPU rendering, Corona does impress in speed for how fast it is on CPU, but doesn't hold a candle to GPU. I see some saying I hope they never make it for GPU, I cannot see any logic in that thinking, why not? why not just to have the option?