So that is what, 87-88 C?
I think my Mini is crazy
I have made a similar test (Prime95 Torture Test + Safari playing 1080p YT video + ...), and - though the temp of the CPU was way higher this time (around 89°C ~ 192°F) - the fan just didn't move, stayed at stock speed (1800 rpm) ---> dead silent (proved it again).
Stupppid little Mac
Edit: (Base Mini, Room Temp: ca. 22°C)