I know that GPU Lightmapper is a preview but since I was waiting for this like five christmas ago, I figured I'd check it out straight away. I ran it with the following specs: i7 6700 32gb ram GTX 1070 HDRP 3.3.0 - preview At first, it ran really well. No crashes or hassle. But it was not as fast as I hoped. So, I checked the baking stats, and it said 10mRays... It got me thinking, "wait, that is too low". So I tried again, then this time I got 89mRays....then I tried again 10mRays again. This repeated test went on for few minutes. Below the stats, it said using "Intel 530" instead of my 1070. So, I figured it must be using my integrated card instead of the dedicated. I checked my GPU usage and integrated GPU was showing 99% usage rate and 1070 around 28%. I couldn't find any options to change in Unity, so I disabled it completely via bios. (I use 4 monitor system with 3 as main and 1 as a duplicate for cintiq) After restarting the pc and making sure integrated GPU was off, I ran the test again. And now the GPU lightmapper crashes Unity as soon as I click the "bake" button. I am sure this will be ironed out soon, but figured any first hand feedback will be good for the devs. Also, adding in the option to select GPU would be really useful. Also great job on the GPU Lightmapper. I can't imagine how useful this beast will be when matured.