In previous threads a few months ago I got setup with Macs Fan Control and have been running Exhaust / Intake at a constant 850RPM due to an issue I've had of IOH Heatsink running a bit hot without it (running around 65-68C). With the increased exhaust and intake it drops into the 54-62C range. Most of the time that's been fine. And when all the cores aren't taxed I don't notice any other problems. Everything else is set to 'auto' in Macs Fan Control. However when rendering and all cores are being tapped I've noticed that this configuration puts CPU A / B at about 80/75 which seems a bit hot and is in the red in iStat. When I set other fans to trigger and work off of the CPU sensors (which is what I would think it would be doing in auto if something was getting hot?) I cant figure out the right combination to keep IOH Heatsink happy in idle and the CPUs happy under load. Does anyone have any suggestions? I did have SMC Fan Control installed at one point but uninstalled it. iStats fan control is off, but I'm wondering if auto isnt working correctly right now? Any suggestions would be awesome.