Would you mind doing a simple (though perhaps slow) test for me? I’m curious as to the speed up ratio for an AMD chip from single threaded to fully multithreaded. In preferences you can turn off the multithreaded rendering. What I would like to see is single threaded vs multithreaded for identical scene where it takes at least a minute (if not two or three) for the multithreaded render to complete. What I’m after is the scaling of the new AMD architecture with the Carrara render engine. My concern is each module (two cores) having only a single FPU and how much Carrara needs FPU resources.