Use this to check your GPU temperature under a heavy gaming load, ensuring it is operating at or very close to 100% ...

You’ll notice that the Hot Spot values are slightly higher than the GPU Temperature. This is because your graphics card possesses multiple sensors and the Hot Spot value denotes the maximum ...

He mounted a small temperature sensor on his graphics card near the GPU, wiring it to an Arduino. The Arduino monitors his video card, lighting an RGB LED blue if conditions are alright.