Is Snow Leopard 64-bit mode required for 4+ gb of RAM?

Is Snow Leopard 64-bit mode required for 4+ gb of RAM? So I hear that Snow Leopard is not booting to "full" 64 bit mode by default, for compatibility reasons, and that one can bypass this by booting with the 6 and 4 keys pressed.
Asked by: Guest \| Views: 203

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Guest [Entry]

"You can access more than 4 GB of RAM even in Leopard. The 6+4 trick is not needed to access more than 4 GB in Mac OS X. The Mac OS X kernel is a 32 bit/64 bit hybrid, allowing it to bypass the 4 GB limitation.

I don't know if you've ever done something like this, but you can go to the Apple Store and just max out the RAM in a Mac Pro; you can add about 32 GB of RAM. This option was also available in Leopard, where the 6+4 trick was useless."