I found this interesting article.
Windows 64-bit vs. Mac OS X 32-bit benchmarks
http://arstechnica.com/reviews/apps/adobe-cs4-review.ars/5
Windows 64-bit vs. Mac OS X 32-bit benchmarks
http://arstechnica.com/reviews/apps/adobe-cs4-review.ars/5
That is very interesting. It looks like those who are really working with humongous files (900mb! Wow...) stand to benefit a lot from the (tragically windows only) 64 bit version, but the rest of us peons are just fine without.
But then 16-biit printer drivers are a Mac Only feature, so it comes out even.
BTW those huge files are not that uncommon, try scanning medium or large format film at 16-bits per channel and look at the file size. That said most of the time Photoshop can run faster than I can think, even on large files on my 2.16Ghz iMac. Yes it lags but if I'm working for an hour all the lagging adds up to maybe 60 seconds an hour. Turns out I am the performance bottle neck most of the time.