I am working with an optical ray tracing software. This application uses EXTENSIVELY CPU computing power (mostly calculating SINE and COSINE functions). At the present I am using a P4 1.8Ghz with 512Mb RAM, and I am looking for a faster one. I would like to know if some one can recommend me a combination of CPu + Motherboard that will give me the best performance. Money is not and issue (well almost...) and I don't need graphic performance (in fact, usualy I start a session close the monitor and return after a few days for results).