X86-64 SGA

Can the SGA size for Oracle 10g, x86-64 database software, be 4 GB? Or is it limited to 2 GB or 1.75 GB? In other words does the Oracle 10g take advantage of 64 bit computing on Intel Xeon EM64T platform?

It is my understanding that Oracle10g for x86-64 is a native 64-bit port of Oracle10g and that it fully supports large memory addressing, i.e. beyond 4GB.

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