I though that both the Celeron and the Pentium 4 were 478 pin chips

I have a 3 GHz Pentium 4 and use Setistash (and Setiwatch for the graphics)
with the CLI version.

All units are under 2 1/2 hours so far.

I have the same setup on a 1.7 Celeron averaging about 9 hours a unit - a
big improvement on using the GUI - averaged 15 hours!