32-bit environment is subject to 2 gigabytes (GB) of virtual address space, shared by Excel, the workbook, and add-ins that run in the same process. A data model’s share of the address space might run up to 500 – 700 megabytes (MB), but could be less if other data models and add-ins are loaded.

64-bit environment imposes no hard limits on file size. Workbook size is limited only by available memory and system resources.

Beginning with Excel 2016, Large Address Aware functionality lets 32-bit Excel consume twice the memory when users work on a 64-bit Windows operating system. For more information, see Large Address Aware capability change for Excel.

Note: Adding tables to the Data Model increases the file size. If you don’t plan to create complex Data Model relationships using many data sources and data types in your workbook, uncheck the Add this data to the Data Model box when you import or create tables, pivot tables, or data connections.

For more information, see Data Model specification and limits.