Memory issue with large size array

We are using x64 compiler and defining large size arrays below and occur the memory issue.

real presth(12,1441,5000,3),presmx(12,5000)

I heard of that in 32-bit Windows, about 1.75GB total address space is the most you can hope for

What is the address space we can use in a IVF program with x64 compiler? Can anyone help to see these arrays are too large to handle by x64 compiler or other attentions?

Thanks!