Tenchu, that's a fast backpeddle! Games will be optimized for 64-bit and released in 64-bit and 32-bit versions. This season you will see both supported, next year the 32-bit versions will become legacy games no longer updated.
Most likely those games will simply use the extra registers in the AMD64 ISA, rather than actually require four or more gigs of memory.
There isn't any need to require 4GB DRAM, that is a strawman. We are talking about the rendering advantages of using higher precision math functions, in addition to general speedup by taking advantage of register passing.
Too bad Itanium isn't a workstation chip, as once envisioned! It would make a great game chip (at the right price).
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