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Originally Posted by HAL-9000
OSX comes in two flavors, 32-bit & 64 bit. The only 64-bit Doze currently available is Server 2003. There will have to be a Athlon Doze, and a Itanium Doze I think. 64-bit Doze for Athlons is in beta. I know because I test it right now on a Opteron.
Many applications, including the whole Adobe suite and Lightwave, amongst others, are compiled for OSX in 64-bit already for sale. You can plug 8GB in your G5 to run those applications. 32-bit can't address more than 4GB or so. So there is a difference. This isn't some fluke, its just one of the few times where its convenient that the hardware guys and the OS guys are in the same company. They were ready for the OS when the hardware was ready. And depending on Microsoft to make launch dates is a formula for doom. Look at the Itanium fiasco. Talk about egg all over Intel's face. This is the biggest goof they've made since their RDRAM adventures of yore.
Don't get me wrong, I'm not some apologist for Apple. But the facts are the facts....and those are the facts.
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There is no 64 bit OSX and no 64 applications for said fictional OS. OS10.4 will probably be the first to have a 64 bit version.
Windows NT, 2000, XP and 2003 are or were made in 64 bit versions (remember NT was orginally designed to run on 64 bit Intel RISC chips and later ported to x86). Presently though only XP and 2003 are still available in 64 bit mode.