Although the 32-bit edition may be sufficient for your installation, the 64-bit edition of Essbase can handle larger outlines and cache sizes than 32-bit Essbase. In computing environments that support it, implementing 64-bit Essbase can improve the performance of existing applications and can sustain much larger applications.
For additional information, see the following documentation:
Oracle Hyperion Enterprise Performance Management System Installation Start Here
Oracle Hyperion Enterprise Performance Management System Installation and Configuration Guide.