My computer is realy slow (200 mhz P1) but i run it 24/7. It always misses the deadline (currently 14 day one and it'll take maybe 18 days to finish) but I still get the credit for it. As far as I know if you miss the deadline the team still gets the points (i've added only like 3 points since i started cause of the time it takes) but the work doesnt go to the good cause cause your folding is thrown away (maybe given to another computer?) cause it took so long. So if your doing it for the cause then being too slow maters an there is no point but if your doing it for team mac rumors then keep folding cause your pounts will count, just take a while to show up.