If you look at the paper for the combined effort recently posted on the main screen and read between the lines.

The optimal depth is nowhere near where we are now. So please keep sieving. I havn't looked at P-1 lately but that may be near no longer optimal :couch: .

I don't have any and I mean ANY figures on this.

You would have to ask the P-1 people how long it takes them to find a factor, not a test but a factor...

Then multiply that time by 1.7 'ish and see if they can complete a firstpass test in that time.

Those factors found by P-1 at this point will probably never be found with sieve, yeah I know never say never with primegrids rate.