As above you could also flip the fan so that the out side air is being forced across the card if the outer cap was back on it’d cool better. You setup now is pulling hot air inside the case and forcing that onto the card. I had fans like those and top speed is only about 5k RPM. Now blowing the out side air in threw the back across the card you would need to have your case fans so they help that incoming air by not blowing hot out of the case so that outer fan is not pulling it back in. That’s why I suggested pulling it threw from the back because as we all know case fan setups are mostly setup with air being pulled threw the front and sent out the back.