Register Log in  Infinite Loop / The Apple Ecosystem    The
64-bit kernel  The 2010 Mac Pro boots into 64-bit mode by
default. If you enter "uname -a" in the Terminal, it shows which
kernel you're running:  Top: my MacBook Pro running the 32-bit
kernel (i386). Bottom: the 2010 running the 64-bit kernel
(x86_64). You could use a Terminal hack or one of the many
utilities out there to change it to 32-bit mode, but there's no
good reason to do this anymore.  There's nothing special in the
2010 Mac Pro hardware vs. the 2009 with regard to 64-bit. Apple
was just giving driver developers some time to polish their
64-bit ports, so they could flick the switch without tossing end
users into an unsupported printer hell. I have switched between
32-bit and 64-bit kernel modes since 10.6 came out, and I
haven't noticed any difference in performance. What benchmarks
I've tried showed speed to be the same.  But there are some
growing pains that I noticed with the graphics drivers. The
machine started up once and the main sc