64-bit OS

axma

macrumors member
Original poster
Sep 3, 2006
37
0
Hi all,
I have some questions about 64-bit:

1) Does new imacs have 64-bit EFI firmware ?
2) Does Snow Leopard in new imacs boot by default in 64-bit mode ?
3) If not, how can i modify the default mode ?
3) Can Windows 7 64-bit be installed using Bootcamp ?

Thx !
 

bolen

macrumors 6502
Jul 22, 2008
351
0
Sweden
I can comment on 4) - Yes, you can install Windows 7 64bit.

I'm also a bit interested in 2), even though it doesn't matter at all. :)
 

zwaffel

macrumors newbie
Jul 30, 2010
20
0
If you have more then 4GB memory, you need to run 64bit right, or can osx address more then 4GB in 32bit?
 

Queso

Suspended
Mar 4, 2006
11,821
7
If you have more then 4GB memory, you need to run 64bit right, or can osx address more then 4GB in 32bit?
Yes OSX even in 32-bit mode uses 64-bit memory addressing. The line between 32 and 64 bit isn't quite as defined as on Windows. OSX is a hybrid between the two, allowing 64-bit apps and processes to run on top of a 32-bit kernel and vice versa.
 

asap18

macrumors newbie
Jul 8, 2010
4
0
Actually from what I've been hearing is that the new ATI drivers are 64 bit only. If they are then the new iMacs must boot 64 bit by default.
 

Rudy69

macrumors 6502a
Mar 30, 2009
658
817
My quad i5 booted in 32bit by default (now in 64bit mode though ;))
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.