I have had a 5400black for a long time running stock speed. I got a little bored so i decided to bump it up. It is at 3.0 with 15x and stock voltage core temp .99.4 readings are at about 60c running prime raising to 63c but staying around 60c to 61c most of the time. Are these temps reasonable at this speed,and what is the safe limit for this cpu.