New answers tagged hardware
Although your Windows installation is 64-bit, ArcGIS Desktop is still 32-bit software and can't use more than 4GB of RAM in a single process. However, you can install the ArcGIS 64-bit Background Geoprocessing addon, that will let you run most geoprocessing tools in 64-bit mode and they can use more than 4GB RAM in that case. There are some exceptions, but ...
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