The 64 bit advantage?  How Much?  Where?

What is going to be the 64 bit advantage of Snow Leapard and LR?
Speed yeah, but mostly where and how much?  These 1:1 previews are probably
the biggest bottleneck I have.  Better now tho. 
Anything else?
Mac Pro Octo 2.26
10 GB memory
512 NVIDIA GeForce GT 120

Rosetta does not help with bitness. It is meant for very old ppc apps and
some printer drivers (Epson for some demented reason is still using ppc code
in their printer drivers!). Both the 32-bit kernel and the 64-bit kernel can
run both 32-bit and 64-bit intel apps, so from Lightroom's perspective it
doesn't matter which kernel you run. To get most of the advantage of 64 bits
apps, you do not need to run the 64 bit kernel you just need to run the
64-bit binary, which runs just fine on the 32-bit kernel. You need the
64-bit kernel if you have more than 96 GB of RAM. No current Apple machine
supports that much memory. If you're interested in this read the superb
review in ars technica:
http://arstechnica.com/apple/reviews/2009/08/mac-os-x-10-6.ars (page 5 talks
about the 64-bit kernel). There are small speed advantages to running the
64-bit kernel, but they are weighed down by some incompatibilities with
certain third-party drivers (think scanners, mouses, cards, full disk
encryption, virtualization software such as parallels and vmware, etc.). On
the other hand, as the tests I linked to above show, there are major
advantages to running apps such as Lightroom as 64 bits. They will run just
fine on the 32-bit kernel so you're probably better off just running the
default 32-bit kernel and making sure that Lightroom runs as 64-bit by
unchecking the checkbox in the get info panel.

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