transcend wrote in post #3064132
Just to be clear, tiger is 64b capable on PPC processors,
G5, not G4 or before, correct?
...and leopard is on both intel and PPC. The mac pro will currently address up to 16gb of ram. How much an application will address depends on the application. I currently have about 5 apps runnign full time + the os. I use far more than 4gb of ram at a time.
As I understand it, when OS X is installed, the installer software checks to see which Mac it is, then installs modules, some of which are 64-bit and others that are 32-bit depending on the machine. This presumably allows OS X to manage both 32-bit apps and 64-bit apps without any hiccups. (I believe this is different with Windows - you have to either install the 32-bit version OR the 64-bit version, which can cause problems for some apps. Someone who knows, please comment.) With the move to Core 2 Duo processors, the iMac and MacBooks (all of which use Merom chips) are now 64-bit capable (the Mini is still only 32-bit capable), but cannot address more than 3.4 gb of RAM because the video component of the chip is still 32-bit. When Santa Rosa comes out next month it should have this problem resolved. I don't think Santa Rosa is pin-compatible with the curren version of Merom, but if it is, then you might be able to upgrade iMacs and Mac Minis by swapping processors (assuming heat is the same or better) since they're socketed. The Mac Pros use Woodcrest (and now Clovertown for the 8-core machines), which are fully 64-bit.
Regardless, Adobe has made it clear that if 64-bit Photoshop becomes available, it won't be until CS4 at the earliest.
"Raw" is not an acronym, abbreviation, nor a proper noun; thus, it should not be in capital letters.