Ok well since no one replied on that one, here is what i finally did.
Bought a 50mm slim (10mm) fan with a 3 pin power connector.
On the Acer xSeries like the ax3812, there is an available system Fan power connector on the motherboard.
The 50mm fan fits perfectly in the back of the case where there are vent holes. So i fit the fan there and could play around with the fan direction so it moves air around the video card.
Dropped the gpu core temp from 70deg Idle / 95-97deg full load to 55deg idle / 80-82deg full load.