I am running my 1.8A at only 2069Mhz right now at stock 1.55V. Using the stock HS/F unit I'm at 28 C (82 F) as we speak. Have our attic fan pulling cool air in from outside and ambient case temp is 22 C (71 F). Case is an Antec PLUS880, 2 80mm exhaust, 2 80mm intake.