I was over at Mersenne forum asking about Prime95? Apparently, you can keep a P-1 Stage 1 file, and re-use it with different Stage 2 bounds.

I was wondering(assuming we're already keeping up with first, which might not be true) if we might find more factors, in a given amount of time, if we try more than one B2 value.

When I do things on my Pentium-D, with B1=120,000, and B2=1,700,000, Stage 1 takes 3hrs10min, and Stage 2 takes 2hrs15min.