[R] 64 bit benefit for dual G5 powermac

[Sek Won Kong,M.D]

Hi,
Can dual G5 Powermac have benefit of 64 bit in terms of memory and maximum
matrix size? I have read several positive postings on 64 bit machine.
If yes, what will be configure looked like other than { ./configure
--with-blas='-framework vecLib' --with-lapack --with-aqua } ?
Thank you very much for helps in advance.
-SW