Hi, if the index size is limited to 2GB on 32-bit platforms, is there a max size on 64 bit?

I'm putting together a site which sooner or later should need a bigger index. Is there any trick I can use to get around the 2GB limit until my site's busy enough to move to a bigger platform? I'm wondering if I can maybe use two or three separate indexes? (My users need to be able to search through all the records in my database)

Thanks
Aethaelwaerd