The OnePlus Nord 4's metal back not only makes it aesthetically unique but adds a special advantage to its performance that no other Android phone offers.
Other than a few deviations, OnePlus has a penchant for value products. The premium OnePlus 12 offers a superior set of features and a refined experience over similarly-priced flagships such as the Galaxy S24 Plus or the Pixel 8 Pro. Similarly, the $500 OnePlus 12R offers exceptional performance and a flagship-like experience for its price. The OnePlus Nord 4, which sits in a price bracket right under the 12R, has its own benefits, but one that stands out is its metal back.
For each of these tests, I ran the tasks for 30 minutes to let the heat build up inside the body and on the surface. After the completion of each task, I waited for the phone to cool down to the original temperatures using an infrared thermal camera and noted the time taken in each case. Here’s how the tests panned out.
How cool is fast charging? The Nord 4 charges at 100W, which is commendably fast. Although the phone charges fully within 35 to 40 minutes, that warrants some heat generation in the process. I followed a similar process as the last time but with one key change. The phone was charged and subsequently left to cool down without any air conditioning.It took longer to return to its original temperature .
Besides turning to the highest settings, I also used OnePlus’ own HyperHDR feature that upscales standard content to HDR for better visibility, especially in darker scenes. But it also increases the brightness and, therefore, demands more of the phone’s hardware. Interestingly, the phone cooled more effectively than it did in the case 4K recording test I ran above, further solidifying my belief that a cooled environment can improve its cooling. For most of the time, the phone remained warm to the touch but never got uncomfortably hot. The internal temperature of the CPU, as per GameBench, stayed around 108 degrees F, which doesn’t show a significant difference from the temperature at the external surface.
About 15 minutes into the game, the Nord 4 started to heat up significantly. It reached a temperature that I would prefer my hot shower to be at on a cold day. While I could endure the heat because it was still short of scalding, I would prefer not to comply. At the end of the 30 minutes, I was glad it was over.
In the AC room, the Nord 4 returned to a cooler temperature five minutes earlier than the last test. In fact, it achieved its initial temperature in under 10 minutes, finally returning to 88 degrees in about 20 minutes of total time. The results couldn’t be clearer and show a convincing picture of the Nord 4’s ability to dissipate heat better than the other two devices. The Realme GT 6, with a plastic back, retains the most heat internally and takes the longest to return to its original temperature. The OnePlus 12R understandably generated less heat internally as the more powerful chipset requires less effort to achieve the same performance.
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