I wouldn't doubt it if it is unoptomized code for both platforms. Where the G5 shines is with heavily optimized code. From what I've read, Altivec is a very powerful tool when used correctly. Apple moved away from the IBM lineup for 2 reasons. The primary one was the future roadmap. IBM simply didn't have the roadmap apple needed in terms of ramping up speeds and turning down heat output. The secondary, much more minor issue was current speed. While a G5 may be an all around slower chip for general usage (although much of that might be due to OSXs design), it wasn't so dramatically slower as to be the main reason for a switch over to Intel. The future roadmap is the key to the switchover.