Under 32-bit Windows, a single program could not access more than 2 GB (ie, about 2,000 megabytes) of memory (RAM).
Under 64-bit Windows, it is possible for one program to access all available RAM. GEMPACK supports the 64-bit GFortran and Intel compilers, allowing a GEMPACK program to access many GB of memory.
Condensing your model (see here) can reduce the memory requirements.
GEMSIM and TABLO-generated programs provide detailed information about the amount of memory required to solve a model.
Related topics:
Should I move to 64-bit Windows?
Large-Address-Aware (LAA) programs
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GEMPACK FAQ Page