It really depends on what you're doing. Video/audio processing; maybe, but only if ALL the software/drivers involved are optimised for 64-bit. Gaming; no. The problem is, if software were to be made to take advantage of 64-bit processors, it wouldn't run on 32-bit CPUs.
In the future, when a sizable majority of the market runs 64-bit CPUs, only then will developers make the switch. Until then, what we need to see is the larger companies putting out two versions of their software: one for 32-bit and one for 64-bit, in the same way a lot of companies release CD or DVD versions.
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