I dont see how a 3200+ would get that hot, my one with stock heatsink, overclocked by 12.5% and the original thermal paste reused 3 times get to 50 degrees on full load and thats onlty due to the fact thats its like 35 degrees ambient at my place (australian summer no aircon)
THere must be something wrong, the heatsink is probably not seated right.
Touch the heatsink and see if its hot, if it is at 70 degrees that should almost burn ur finger, if its not hot then its either the mainboard reporting wrong temps or the sink is not mounted properly.