- Aug 14, 2010
- RX 580
- Classic Mac
- Mobile Phone
Snow Leopard default was 32 bit. If you wanted to boot it 64 bit it required you to specify in the boot-args for PC-Macs or add it to com.Apple.boot.plist for Macs.Im sure that Arch=x86_64 forces OS X to boot between 32bit and 64bit but its not really needed on Intel CPUs tho is it.
You had to be careful because some apps - Kontakt for example - would crash immediately because they were 32bit only.
It was either Lion or Mountain Lion where Apple went 64bit totally - cannot remember off the top of my head right now which one it was.