Thanks so much. I've been speculating that a single 64 chip may just be faster than a dual motherboard athelon setup. Granted Poser does not use dual processor, it would be fast on a dualie because the other multitasking apps can run on one chip while poser hogs the other, but the calculation speed of the 64 chip is phenominal. So, glad to hear this. I'm inclined to upgrade in a few months and have to make the big decision of dual or 64.