I just switched from v.21.4 to v. 22.8 because of the error 29 message, and my ending date for the number it's working on jumped from 9-11 to 9-5, is v.22.8 that much more efficient than 21.4? This is on my Athalon processor. I have a pentiumIII I'm going to upgrade also, will it speed it up too? _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers