Graphics Card Thermal Imaging Temperature Measurements

Thermal Imaging Temperature Measurements

Recently we started adding Forward Looking Infra Red thermal images of hardware. Over the past years we have been trying to figure out what the best possible way is to measure temperatures on hardware. Multiple options are available but the best thing to do is to visualize heat coming from the product or component being tested. The downside of thermal imaging hardware is simple, FLIR camera's with a bit of decent resolution costs up-to 10.000 EUR. Hence we passed on it for a long time.

With a thermal imaging camera a special lens focuses the infrared light emitted by all of the objects in view. This focused light is scanned by a phased array of infrared-detector elements. The detector elements create a very detailed temperature pattern called a thermogram. It only takes about one-thirtieth of a second for the detector array to obtain the temperature information to make the thermogram. This information is obtained from several thousand points in the field of view of the detector array. The thermogram created by the detector elements is translated into electric impulses. The impulses are sent to a signal-processing unit, a circuit board with a dedicated chip that translates the information from the elements into data for the display. The signal-processing unit sends the information to the display, where it appears as various colors depending on the intensity of the infrared emission. The combination of all the impulses from all of the elements creates the image.

Why a move towards Thermal Imaging?

A new trend e.g. cheat is that manufacturers are tweaking their products with another offset, meaning that sometimes (and we have seen this only a couple of times) the temperature reported back by monitoring software often was lower than the product is in reality. With thermal imaging this becomes a thing of the past as we can see hotspots on the PCB indicating for example GPU but also VRM temperature as well as how heat is distributed throughout a product. We do hope you will enjoy this new technology as it did cost us an arm and a leg to be able to implement it. 

Above, you can see the graphics card in IDLE conditions. We position our measure point in the GPU die area at the backside of the PCB. You can see that's just gorgeous as we at roughly 30 Degrees C here.  

Once we start to stress the GPU the thermals change. Now we can measure thermals into the 10th of a degree precise really. You'll notice that the VRM zone at the M2 position is running a cool 55 degrees C, that's just great. The GPU 45 Degrees C, and the memory reaches 49 Degrees C. These are to be considered excellent temperatures throughout the board and shows that Nvidia can run very little voltage through the GPU which obviously explains the low power consumption as well.

When we position the thermal camera outwards we can see that despite what we all say and think about the cooler, it is NOT exhausting a significant enough amount of hot air to the inside of the PC. The hottest point is the VRM area and GDDR5 memory, but it is so low that it is insignificant. So yeah, that's pretty nice cooling.