On stock thermal compound and with the cooler's fans at stock voltage and frequency, the Intel Core i7-5960X runs about as well as the Intel Core i7-5930K and Intel Core i7-5820K. With a full load under Prime95, the Intel Core i7-5960X has an average TDP of close to 139W. As you overclock, heat builds up a lot quicker with the Intel Core i7-5960X, at the same clock as the other two processors; the Intel Core i7-5930K reached 39 degrees Celsius in idle at 4.2GHz as compared to the 43.5 degrees Celsius in idle with the Intel Core i7-5960X at 4.2 GHz.