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1. Leopard OSX is 64bit compatible and will run in 64bit when installed on compatible hardware.

2. Most drivers (kexts) are not written to take advantage of 64bit.

3. Snow Leopard 10.6 should be a giant step toward 64bit sweet action.

 

For example you can use the -legacy flag on boot to force osx to run in 32bit mode. In turn by not using this flag, granted you have the right hardware, you will be running in 64bit. The problem is that as I mentioned above most kexts are not 64bit and most software does not take advantage of it. I have been told that one issue that can arise from not using the -legacy flag is that some PPC applications may have trouble running via Rossetta.

 

If you are looking for 64bit to allow for more RAM to be alocated there is a fix depending on your chipset. I have been running this modified 64bit kext on my machine with 4GB and have had no freezes for the last few weeks. http://forum.insanelymac.com/index.php?showtopic=127611

 

If you want true 64bit all the way around you will want to go the linux route. There are 64bit linux OSs, 64Bit drivers and 64bit applications. Even then there are problems say for example you use may be able to install OS, Drivers & Apps but there is a slim chance that any 3rd party plugins made for your apps will be written to support 64bit.

 

So basically in short 10.6 is where the sweet action starts.

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