As things are at the moment, there's little or no advantage to using any 64-bit processor with Poser. It needs the programme and OS to be compiled to use the extra 64-bit features. And if you wait until the software is there, you'll find more power for your money. Memory bandwidth, and the amount of physical RAM, do make a difference. I'm afraid that I'm not up-to-date on the details of that, but the faster FSB is going to help. Just check what the limits are on your current RAM. There is, incidentally, no reason why you can't run fast RAM on a slow motherboard, as long as it is the same type.