It’s not just about memory. The path tracing algorithm is a natural fit for CPU threads but very difficult to design for efficient use of GPU threads. It’s very

It’s not just about memory. The path tracing algorithm is a natural fit for CPU threads but very difficult to design for efficient use of GPU threads. It’s very easy to leave many of your GPUs threads idle due to the divergence, or overflowing the registers, and any number of other things that are very natural to path tracing.