For the pentium M, I cannot say. People usually say a 1.7Ghz PM is equal to a 2.4 PIV. More or less. This is due mainly to the large cache and (probably) to the shorter pipeline. As for 3D apps, the performance of the Pentium M has yet to be proven. Nobody ever talked about it, nobody seems interested into finding out. I tried out a dell D600 with a 1.5Ghz and found it damn slow, but I guess it was probably due to the 4200Hd and the lack of ram, so don't take my word for it. I GUESS that if you just do modeling and previews, the PM would be fine. If you do rendering you should consider a Dothan 2.0GHz (which is a fine processor indeed.. in Japan they're selling mobos to replace the PIVs with the Dothans in desktop computers... They say is formidable..) .. but at that price you should probably go for an A64 2800+ instead which has almost the same performance and comes quite cheaper.