I have XFX Radeon HD7870 with latest drivers:
Windows Version Windows 7 (Service Pack 1) (64 bit)
Graphics Chipset AMD Radeon HD 7800 Series
Device ID 6818
Vendor ID 1002
BIOS Version 015.022.000.001
Radeon Software Version 16.7.3
Radeon Settings Version 2016.0718.1747.30147
Driver Packaging Version 16.30.2311-160718a-305077C
The problem is that one fan is out of control, it is almost always at maximum speed, but sometimes it slows down for a short amount of time and it happens randomly.
I'm not using any software to change or control anything related to video card. I tried AMD overdrive to control fan speed, but only one fan responds to settings, second ignores them and spins at max.