Scene file load crashes

[npg]

17-18GB is way over the onboard memory of these GPUs, so it's no wonder it's causing problems. The OS can swap between onboard GPU memory and system RAM, so this is probably how it worked, but it is not reliable - this is why we have the "safe allocations" option. We will be working on reducing memory usage in the coming months, specifically per-pixel data we allocate. But if there is too much geometry the only way to fit it in GPU memory is to reduce the geometric complexity of the scene.