Mugen 2 on E8400

How much paste did you put? If you spread it, it should be as thin as a sheet of paper. What is your room temperature? Getting the CPU temp in the 20s requires a room in the 10s.

That's too much. Spread it as thin as possible (I use an old credit card to do it) or apply the size of a grain of rice in the middle. Heat paste should fill the voids between the heatsink and the CPU; it shouldn't act as an insulator between them.

Give more details, case, airflow, ambient temperature, cpu fan speed at max or not

why didnt you overclock by the way.

redoing the thermal paste wouldnt make much of a difference and i suggest you use one of the better thermal pastes

i haven't overclocked because i haven't fixed this problem and my settings keep going bak to default from installations . I just reinstalled and went through lots of trouble with my board keep grounding in dual channel mode for RAMS i no it doesn't make sense but i've gone from dual channel to single channel now and the temperature dropped by 2 at least i have 1 fan directly blowing through mugen 2 and another fan exhuasting on the other side both going at 1200 rpm and around 47avg CFM i really regret reinstalling