New answers tagged 64bit
64-bit Background Geoprocessing with ArcGIS 64-bit Background Geoprocessing installs a 64-bit version of Python 2.7.2, NumPy and Matplotlib if they are not already installed. By default they will be installed to C:\Python27\ArcGISx6410.1 (note the x64 in the path), an additional install from the 32-bit Python (C:\Python27\ArcGIS10.1) that Desktop ...
See here. ArcMap (ArcMap.exe) is still a 32bit application and as such is limited to 4GB. The 64 bit background processing addon allows some geoprocessing tools (RuntimeLocalServer.exe) to run in 64bit.
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