Amd Turion 64 Mobile with power now 2ghz ,1mbl2 cache 1600mhz bus  with 2
gigs ram I have no problems now. But i use to have to save an reboot
constantly so that i did not use up resources had a p3 with 1gig. I usually
have 12-14 columns with 3-5 sheets and have only used up the memory once I
was running formulas using 10 columns 6 more than my normal i normally have 2
to 4 charts in the same book they do open slow some times.  I still have
problems with windows clunky notepad and wordpad when i try to replace data
lockups all the time