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Guru3D.com » Review » ASUS GeForce GTX 1080 STRIX OC 11 Gbps review » Page 10

ASUS GeForce GTX 1080 STRIX OC 11 Gbps review - Graphics Card Thermal Imaging Measurements (FLIR)

by Hilbert Hagedoorn on: 08/01/2017 11:50 AM [ 4] 10 comment(s)

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Thermal Imaging Temperature Measurements

A new addition to our reviews will be the inclusion of 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 cameras 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. We can seek 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. 

 


We can measure accurate temperatures at the GPU and VRM areas. So once we start to stress the GPU the thermals quickly change. We can measure thermals down to a 10th of a degree, our thermal camera was calibrated in 2017. 

  • We reach 53 degrees C on M1, the GPU marker at the back-plate. It is however covered hence we cannot get an accurate enough reading.
  • At M6 to M9 we are close on the VRM area, at ~85 Degrees C. The POSCAPs light up, we've discussed these in the component photography section.

The thermal image shows that the back-plate could be trapping a bit of heat. We've seen closed back-plate designs on the Founder edition cards, and such designs are not our favorites, we like to see lots of gaps to vent. The ICs on the VRM side run hot though, more than I'd like to see.
  



When we position the thermal camera outwards we can see that the overall cooler design works well. The hottest point is the top side of the card where there is residual heat detected. Remember, this is the graphics card 100% stressed in a FireStrike scene 1 loop. As you can see, the card is not exhausting heat so all heat will be vented and dumped inside your chassis.

 

A bit of heat is exhausted at the top side, at the M1 position at 78 Degrees C, the VRM area. That heat is escaping and will end up in your PC. Concluding, the card produces only minor heat under full stress but most of it is directed into your chassis so ventilation inside your PC is (as always) a must. The overall thermals overall I'd rate as okay. 




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