A GIS administrator installs and configures an ArcGIS GeoAnalytics Server machine with four cores and...

ArcGIS GeoAnalytics Server is designed to perform distributed analysis on large volumes of spatial and temporal data. To efficiently process large datasets, it is recommended that each machine in the GeoAnalytics Server site has at least 16 GB of RAM and 4 CPU cores. However, for optimal performance, especially when handling very large datasets, increasing the available RAM can significantly improve processing times.​

In this scenario, the machine already has 16 GB of RAM and 4 cores. Adding more RAM would allow the GeoAnalytics Server to allocate more memory per job, enhancing its ability to process large datasets efficiently. Therefore, the recommended action is to add 16 GB of RAM to the GeoAnalytics Server machine.​

Reference Source: ArcGIS Enterprise documentation on GeoAnalytics Server system requirements and performance optimization.​