Mac Pro 5,1 Fans full throttle, SMC reset does not help

Hello Community,
i have the following issue:
- Mac Pro 5,1
- Latest Firmware; no SMC update available
- Fans (of case, not graphics card) running full throttle as soon as OS X is active (installed or in a installation phase).
- During boot up, fans run at usual speed/silent.
- SMC reset (according to: Intel-based Macs: Resetting the System Management Controller (SMC) - Apple Support) does not help the issue, nor did resetting PRAM.
- Removing mainboard battery did not fix it.
- Resetting the battery using the onboard switch did not fix it.
- Detaching components and reattaching them (RAM etc.) did not fix it.
- Detaching device from Power for a prolongued period did not help.
- Apple Hardware Test AHT (off the original installer disk shipped with the device) tells everything is healthy.
- Having clean installed OS X (both:latest releas and also orignal version from original grey installer disks) did not help.
Then: installed MacsFanControl which allows for checking each of the sensors and each of the fans. using them one by one as a control for the fanspeed, which always succeeds: every sensor delivers meaurements, every fan reacts to adjustments of rotational speed.
BUT: As soon as you choose to let the SMC do the job of controlling the fans, fans switch back to full speed again.
All this after having installed VMWare ESX 5.5 on the machine and then having reverted to OS X 10.10.1/2.
Looks highly like SMC won't get properly reset or may some setting is written where SMC reset does not operate?
Any hint would highly be appreciated since i'm not sure whether i should trust this machine which is meant to act as a server.
Best
osxhag

Hello Community,
the above phenomenon turned out to be rooted in s.th. completely different & unrelated.
Obviously there is a system's preference for the 1st PCI-E slot for the RAID controller to be connected to.
You actually may well plug the controller into slot 2 and 3 as well, and the system will then still boot, even after having moved the controller to a different PCI-E slot (after having installed the OS!), but always the SMC will react like described above. Still not sure what the aforementioned symptoms actually indicated (jsut "irritated" SMC or SMC flat out inoperable) - time's too scarce to investiate this any deeper, sorry...
Best
osxhag

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