I would like to know the precision for an ArcGIS raster stored within a file geodatabase (FGDBR format); I can't seem to find this information anywhere in their documentation (apologies if I have missed the obvious...). By precision, I mean the number of decimal places that are used to store the value for each grid-cell (not the coordinate values for spatial referencing). I know this is 6 for the GRID format, but can't find the equivalent info for the FGDBR format.
The reason for asking is that I get different results for exactly the same processing when I use FGDBR vs. file stored GRID raster datasets. I am interested in the cumulative sum over the entire raster grid; there is a difference of approx. 0.5% between the two methods (i.e. a result of 5301.316 when the analysis is carried out in a GDB, compared with 5323.825 in a file storage system).
EDIT: In addition, students have reported getting vastly different answers when using 64 vs 32 bit machines; I don't have the values for these though. I will add when I can repeat the results myself.