sp_helpdb was enhanced in 15.7 SP50 and SP100 to output this "user-createdenhancedperformance temp db" status. Prior to this change the durability setting still caused a difference in the sysdatabases.status4 field, sp_helpdb just didn't reveal the difference.
Select name from sysdatabases where status4 & 8192 = 8192 will show the databases where the durability level of "no_recovery" was explicitly set when the database was created.
