Hello, as the titled said while idle all three fans not spinning but when I play games two big start spinning, the small one don't .
So how I can check if this fan working or not. I just bought GPU three weeks ago.
The small fan is controlled separately from the 2 bigger fans and it starts running on a higher temperature.
To make sure it is working, try running Benchmarks for longer period of time until your graphics card reaches 65+ Celsius
Just google for 1 and take any that can benchmark your GPU. Leave it to run for a while untill your GPU temperature rises (i mentioned that before) and you will confirm whether the small fan is actually working at 65+ ish celsius