have you found out the problem yet e-anima? "4K and mental ray?? no doubt you are using ray tracing too?? I think you'd need a quad processor.., or you will be waiting until next year for the render." hahaha just for one render! wow :p just say a 1 core processor renders a image in 1 min how long will it take for the quad core you think? also e-anima, try a google search to see if you havnt found the problem yet or check on alias forum. Marlon