64-bit has little to do with speed.  It is more about accessible memory space than speed.  There is a slight speed boost in the memory access/bus management.  Nonetheless, what you get is less constriction on how much stuff can be in memory.  Believe me, some of these figures take up hundreds of MB not including their large image maps and so on.  Plus, multithreaded-ness is definitely a speed advantage.  How couldn't it be?  Instead of one single processor working on the entire thing, you have two or four or eight processors working on it SIMULTANEOUSLY.  This isn't about apparent multiprocessing like the old HyperThreading - this is REAL multiprocessing capability.

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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