Yes, well, depending on what the intended use for the system is, don't go too extreme with the testing.So, the general consensus is that the MB will handle extra 5W for CPU and I need to keep an eye on the CPU temp and, if it'll get high with clean heatsink fins, think about replacing the cooler for a better one. The one I mentioned above, Dynatron R17 is rated for 160W.
I just ran a rendering for 1.5 minutes (ART rendering engine - CPU-heavy) and the temp of all CPU's went from about 30C to 70C. Later I'll experiment with longer rendering times and monitor the temperatures.