Uh oh - now we have a holy war! PAGZone is right that it is kind of like comparing apples to oranges in the fact that the Pentium is a CISC based chip while the PowerPC is RISC based which means that a the same C++ code compiled for PowerPC reduces down to less machine code instructions then if it was compiled for Pentium (I might be talking out of my bum here but I think that is the difference between RISC and CISC) that being said, clock speed is less of an issue when comparing a P4 to a G5. Bus speed is significant too but the diff between 800mhz and 1000mhz is probably pretty negligiable! Still, a benchmark is a benchmark. If you render the same complex Vue scene on a Mac and on a Windows box and get out the stop watch, one will likely be faster than the other. I guess it's all a matter of personal preference - the rest when it gets down to it is just a big pissing contest ! This is coming from a previous hardcore Mac evangelist who has switched to windows although OS X and a G5 is probably a tasty combo :)