I am considering an upgrade to 32GB of ram to overcome the crash I often encountered with GeoConvert. With 16GB of ram, I have to stay under something like 50nmx50nm for one region, otherwise it will crash during the conversion. So do you still have crash with 32GB of ram?
Also I never experienced any crash when I am using FSET to convert the map into FSX scenery, so there might be room of optimization for GeoConvert.