The results on this page tell two stories. On the one hand, Cubi 3 Silent appears wonderfully efficient and manages to keep CPU core temperature to 55ºC without any fan noise. On the other hand, those numbers are understandably low because the CPU is automatically throttled when temperature hits 55ºC, which is almost immediately.
There's a choice to be made; Cubi 3 Silent makes no noise but hampers performance; Cubi 2 lets the CPU run free with a bit of fan noise. We know which one we'd choose.