NVAC is essential and must have in fallouts. Unlike Oblivion's crash "fixer" which was simply suppressing exceptions without actually fixing anything, NVAC does fix shortcomings in the code and let the game crash in case of real errors.
Good point about the 4GB patch, as Epic uses the latest version of Fallout 3 (18.104.22.168) that has Games for Windows removed, it causes problems with mods, got to use the Fallout Anniversary Patcher that downgrades the executable to 22.214.171.124 for FOSE compatibility, automatically runs FOSE if there, adds 4GB support, improves mod limit fix, stops Intel GPU crash, and re-adds the GFWL removal. So that is an instant mod. 2b1af7f3a8