8 Go ram needs 64 bits with SL 10.6.7 ?

I have a 13' MBP Mid 2009 and i upgrade it with 8 Go Ram.
Must i boot with the 64 bits mode to have full advantage of the 8 Go ?

OK...but, if there is no advantage (speed, or performance) for 64 bits mode, why Apple gives that option ? For what use ?
I believe 32 bits mode can't adress more than 4 Go. Normally, MacOS 64 bits must run fastly with 8 Go ? Probably i miss something...
Several reasons.
The 32-bit kernel man manage up to around 32GB of physical RAM, then it needs more address space for all the tables it needs to keep track of things.
At the current rate memory is doubling, high end Mac Pros will soon be unable to boot a 32-bit kernel, and in a few years laptops will start to have the option for huge amounts of memory.
While the 32-bit and 64-bit Mac OS X kernels can run BOTH 32-bit and 64-bit applications concurrently, the device drivers MUST be built to work with the bit size of the running kernel.  Snow Leopard gives 3rd party developers a chance to develope and debug their drivers and get customers to field them long before Apple goes 100% 64-bit kernel.
Go look at Applications -> Utilities -> Activity Monitor -> Kind to see the mix of applications currently being run on your Mac.

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