"The biggest surprise was how much cooler the N100 ran, very impressive considering the environment it's in and compared with the N5105. The graphs for the N100 are on days with slightly lower max and min temps, but only by a few degrees. I had thought the smaller size/mass of the N100 box would mean it could transfer heat slower, but it really surprised me. I'd say it would be even more effective if the case was the same as the N5105.
I did re-paste the N5105 when it arrived, but I didn't bother with the N100. Neither had any gaps I could see. In terms of power usage, I measured 14.5 watts for the N5105 and 11.3 watts for the N100 when in production.
Yes I know both chips are massive overkill for pfSense, but I recommend the N100 given the thermal and power gains, unless price is the most important factor for you."
Source: reddit