3d max 8 and win xp 64bits

Hi, Im about to make some tests regarding the 64 bits plataform.
I am aware that is the best thing to have 4gb of ram in the 64 bits PC´s 
(intel core2duo e6600). And that there is no time difference in the 
render time using vray (what are your experiences anyway in this matter 
of render time?).

The main issue here is that we would like to have some PC´s running in 
32bits and the other (the render farm), in 64bits... at least in the 
test. Is there any known issue with having both plataforms at the same 
time? For example if i want to render with both 32 and 64 bits machines??