What GMP version are you running? GMPbench: 75.594 Cool, we have a new low-score result (unless you count the results from my old 233 MHz Pentium laptop from 1998)! Does this machine have serious FPU problems, like T1? Then GMP 5.1 should help a lot, but the solid last place will not be threatened by these optimisations. :-) -- Torbjörn