How to understand the Spectrum Spatial Analyst Memory Recommendation

As far as Analyst is concerned 1GB Ram per service should be adequate for most use cases. The application is not memory intensive.

The performance of Spectrum Spatial itself will usually be a bottleneck far earlier than Analyst itself is.
Hence if there is to be heavy concurrent use of Analyst with large data sets then I would focus on Spectrum first and look to add more resources to the Spectrum Server (processors and memory).

If there are spare resources on the Analyst server then adding them to Analyst rather than Admin Console or Locate service would be best as it is likely to see more use in pure terms of user sessions.
Environment Details
Product Feature: General
UPDATED:  October 17, 2017