I'm on 1.20v for 2 days, but haven't tested prime95 for an hour. When playing Dota2 , I'm getting about 69°C core1 max. BF3 I think it reaches 72°C? So do you think I should still go on 1.25v that you recommend ? Because Intel said for Q9550 TCASE = 71.4°C, so increasing voltage = increasing temp too right?
Voltage means temps, so you need to add more airflow, get some better ventilation, a better cooler maybe. Your computer should shut itself off at 80 degrees, and unless you use it 24/7, you can let Prime95 go for hours until it crashes or your temps max out. To have it stable, you need to increase voltage, to increase voltage, you need better cooling.