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I have 16Gb and have installed 64-bit background processing, but ArcMap seems to only be able to access 4Gb. I can use more in total with other programs. Is there a setting somewhere in Windows or ArcGIS that is only allowing it to access 4GB? Thanks.

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  • This is really amazing.
    – mdsumner
    Jul 31, 2014 at 8:42

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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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