64Bit can handle large files.

I had to build a large containership into high detail, my file ended up 1.8 gigabytes. And i had no crashes or any other problem.

Do note ram is important.

when i had 32bit i had lots of problems lots of crashes.

my specs

Q6600 Quad core 2.6
Geforce pny 8800 gts
8 g ram crossair