Why would you want to override the iMac Pro's con trolling the fans as part of the system software?
If you are experiencing problems take it straight back for exchange.
By controlling the fan speeds one can increase the cooling affect to lower the Processor temperature and thus reducing the amount of frequency throttling. Apple has been conservative by running the fans slower for noise control at the expense of performance. That in itself isn't a bad goal/strategy but for a user that doesn't care much about noise they can get better performance by overriding the stock fan speed software.
Which Would be relevant if all reports and reviews hadn’t mentioned specifically how brilliliantly the iMac Pro deals with heat, fans and noise with no interference.
Yes, not all reviewers are savvy or smart enough to realize that computer cooling is a design compromise. Do you design for optimum noise control or for optimum performance? Apple typically has always gone with the former. This allows, and does not disallow people who would like to optimize for performance to have a 3rd party after-market solution to override Apple's fan/cooling design by controlling the cooling themselves with a fan-control program.
Some people want to get the last ounce of performance out of a computer.
I think Apple's machine cooling design approach meets the expectations of the majority of iMP users.
Yesterday we were using our iMP and running it flat out using all 10 physical and logical cores in the machine. There was no noise at all (nice) and the Processor frequency was holding pretty darn steady between 4.0 and 4.2 GHz. The temp was held below 90ºC and would fall off a bit and then climb back up some. Could we have done better getting better performance if we were to have run the fans faster and keeping the temp lower by say another 10 or 15ºC to avoid too much frequency throttling and have a higher GHz..... I dunno, but if there was a 3rd party program that controlled the fan speeds we could have experimented to find out.
All ten cores were running at the stated boost frequency for running ten cores, what’s to test out? It’s doing a brilliant job exactly as advertised. I can’t see why you would muck around with it. If you want overclocking and customisable cooling buy a pc or wait for the upcoming Mac Pro, if you buy an all in one you deal with the limitations of a set power supply and cooling solution as with all all in ones.
I would not be surprised if fan speed is now controlled by the T2 chip. If so perhaps that might explain why MFC cannot read / control it.