I am in no way trying to sound like a jerk here but I really think this is an unfair comparison.. 32-bit and 64-bit are two entirely different technologies when you get right down to it..
Not to mention 64-bit automatically has a huge advantage by being able to address and "use" 128GB or more RAM..
(Yes, I'm fully aware of the fact that presently there aren't any Desktop boards designed to hold 128G or more but the fact remains that a 64-bit Windows OS (Vista/7) can indeed address and "use" that much)
It would be like comparing the amount of
Stream Processors on an ATI GPU to the amount of
Processing Cores on an Nvidia GPU.. ya just can't do it..