Tomshardware has some figures on the new AMD 64bit CPU http://www.tomshardware.com/technews/20021016.html#093300 and macrumors as some figures on the new IBM PPC chip so I have compared then below. AMD 64bit CPU 2Ghz SPECint2000 score of 1202 SPECfp2000 score of 1170 NEW IBM PPC (Power4 Lite) 1.8Ghz Specint2000 score of 937 Specfp2000 score of 1051 So the AMD chip is faster but only at a higher clock speed. But the AMD chip will be out first. One thing is sure the IBM chip has a better Floating point unit than the AMD, which means it is better at 3D graphics and massive number cruching. Also the AMD chip is about the same speed as a 3.2Ghz P4 chip will be. So Mac fans do not need to worry that much.