Rig is 12*1050ti on G4400. Even though they have a lot of dust on them now, it is not why they are running hot as I have switched back to HiveOS and temp are back to normal.
Example with ethereum :
On HiveOS OC settings are- Core Clock : 100 Mhz, Memory : 1950 Mhz, Fan speed : 69, PL : 57 temps are usually +- 59C
on Afterburner : Core Clock : 100 Mhz, Memory :+950 Mhz, Fan speed : 78%, PL : 72% temps are 64-69C
You have normal temperatures, don't worry. I think that below 75 degrees the temperature is normal. On my GTX 1070ti the temperature is 70-72 and they normally work.