I have a BP6 duel P400 celeron system. Yeah I know it is a slow but going to XP and adding a second CPU got my WU time down to 21hrs per unit. Now SETI is only using 48-50% of my CPU usage.
SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. AstroPulse is funded in part by the NSF through grant AST-0307956.