32 or 64?

I realize I can just try this on my own, but I don't want to crash my system the way Aperture did. So... I use a Mac Intel Core 2 Duo with Snow Leopard and want to know if I can run LR2 in 64 bit. 32 bit is checked in the Get Info box. Is it safe to uncheck it and run in 64 with my configuration? If so do I need to boot holding down the 6 and 4 keys, or will it run 64 automatically? Thanks. Jerry

Oh and you do not need to boot the kernel in 64-bit mode (which is what happens when you hold 6 and 4). Mac OS X can run either typer of binary regardless of the mode the kernel runs in. There are someindications that 64-bit Lightroom might be a tiny bit faster when run on a 64-bit kernel, but the difference is too small too worry about and much much smaller than the difference between 32-bit and 64-bit Lightroom itself. So don't bother.

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