Ideal system configuration for fluent

hari

hi, I am doing car park ventilation system using fluent Am having grid cells of 14-20 lakhs.

i initially started my simulation with 4 GB RAM system having 32bit windows XP system was slow while doing meshing and i upgraded the RAM to 8GB now meshing is quicker but takes more time to export the mesh from gambit

should we have to go for 64 bit processor or what is the ideal config

thanks in advance

regards,

Hari V.B.