Today I don't know 32bit processors, the Celerons, Pentium, Semprom, Athlon and Phenom, all 64bit.
And my problem is I have a 64bit system with 4gb ram and a 32bit system, only recognizes 3gb
How much work with renderizations 3D, videos and publications, a 64bit system tends to be faster for me.
This does not say that a system 32b is slower, but only in some operations, the 64bit system is faster.
But on the day by day, feel no difference