I have a TT Sync Controller, 2 240mm riing fans and 3 120mm riing fans with an ASUS Crosshair VIII motherboard with current BIOS.
The 3 120mm fans should have a maximum RPM of 1500-ish, but no matter what I do, I can't get over ~750 RPM.
I have a PWM cable connected from the side of the controller with the 3 fans. I've set the BIOS fan controller to 100% and checked its RPM in the monitor, it shows ~750RPM. When I set it to 50%, it shows ~375 RPM. Without PWM cable connected, the fan speed doesn't seem to operate at its fastest speed (I would expect 1500 without PWM control on this controller).
When I switch over to the TT Riing Plus controller that connects directly to USB, I can use the TT Software to reach 1500 RPM.
To me, this seems to imply that the Sync controller is estimating the maximum RPM incorrectly. Do I have a defective controller?