If the fan of the graphics card is spinning very slowly or not spinning then it might be faulty. Then you have to replace the fan of your graphics card with newer one. You can also speed up your fan speed by overclocking software if your fan is not spinning at full speed. Most fans have automatic speed control which reaches the maximum speed when the graphics card is working on the full swing during gaming.
Add Cooling solution/cooler:
Your graphics card already comes with the cooling solution but in some situation(most graphics card uses only heatsink fan which is not good enough), it won’t help to reduce the temperature of your graphics card, in this case, you can add some third party cooler/cooling solution to reduce the temperature of your graphics card. The water/liquid cooler is good at reducing the temperature of your GPU. Before buying it you have to sure that it fits properly over your graphics card otherwise your wasting money on it.

If there is no proper or bad airflow in your PC case then you’re dealing with many problems. Make sure you have a good airflow inside your PC if not add some extra exhaust fans inside PC. You need a good PC case (roomy PC case) to add such ventilation for exhaust fans.

There may be a reason for the increase in temperature due to the thermal paste because of the thermal paste may be lost its effectiveness due to overheating or its span of life. Thermal paste is meant to lasts for several years but in some cases, it may lose it potential like taking/shaking cooler or heatsink from the CPU. For applying thermal paste, you have to remove the fan and heatsink and remove the residue of older thermal paste and then reapply the thermal paste over the CPU and place the heatsink over it. We recommend using Noctua NT-H1 because it has an incredible lifespan.
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Disable Overclocking:
By overclocking your graphics card you are making your graphics card to work on full potential which may lead to the overheating of GPU. If you have overclocked your graphics card for better performance then you have to revert it back to the GPUs original clock setting. You can downgrade or disable the overclocking of your graphics card by using overclock software or tools. If you disable the overclock then your GPU temperature drops by instantly and the clock frequency or speed is also get decreased.
Update drivers/install the correct driver:

Update of the driver for your graphics card is essential. Most manufacturers provide the timely update for your graphics card if you didn’t update it cant handle such operation and end up an increase in temperature. If you have installed the wrong driver for your graphics card then it may lead to failure of the graphics card. So you have to update the correct driver version of your graphics card provided by the manufacturer.
The above cases or factor are the overheating issues in your motherboard which can be minimized by taking necessary action at right time. Though overclocking is not good for any graphics card components and other components (such as processor, memory and other) and it may lead to overheating of your CPU.