In MBP I could boot to use the 64 bit kernel from this I have to check if firmware supports it by entering below in Terminal
ioreg -l -p IODeviceTree | grep firmware-abi
If the return is ‘EFI64′ then I just need to boot by pressing the ’6′ and ’4′ keys together while starting up.
After trying Windows 7 x64 bit with Office 2010 x64 bit public beta I just couldn’t see much difference in performance. There is also printer driver support problem if I run Windows 7 x64 in the office. However it looks like that memory utilization is slightly better in OS X running 64 bit.
Now if you want to boot into x64 all the time you could modify this file
/Library/Preferences/SystemConfiguration/com.apple.Boot.plist
to insert this between ‘string’ tags
arch=x86_64
Before you do the above first of all you’ll need to gain root privilege into your MBP. Haven’t done this before here’s the way.
