Yeah, I could be wrong, but I'm seeing 5 temp sensor's built into the unit, one for each fan amp and one for the AQ5 CPU. I'm currently only using 2 fan channels and I can clearly see the higher temp of those two amps vs the last two. I don't think it has anything to do with the fan, it's just the heat being dissipated based on the current and reduced voltage setting.

These little fan amp temperatures are what I figured will be the limiting factor in how much fan you can string together and how well the heatsink or waterblock works. I'm not sure the AQ5 CPU temperature is ever a limiting factor, but I haven't really watched it as it's loaded. Perhaps logging all the channels possible, etc might start raising temps...not sure.