Temperatures, Cooling and Noise
The Acer Aspire S7-392 is a thin Ultrabook, so this could play into how it manages heat.
As you can see, on the front of the system we logged a maximum temperature of 103 degrees Fahrenheit. This high temperature was located towards the top of the system, away from anything you should be touching frequently, if at all. The keyboard stayed below 90 degrees, which is acceptable in my book, and the palm rests barely broke 80 degrees.
Moving around to the backside, temperatures were worse. The maximum observed temperature was 116 degrees Fahrenheit. However, the rest of the temperatures observed were all less than 100 degrees. Using the system on your lap while fully loaded would still be ill advised, though likely doable.
The maximum observed GPU temperature was 78 degrees Celsius, which is the same as the CPU, as they are on the same die. The CPU reached a maximum of 78 degrees Celsius; this is a bit hotter than I like to see chips running at, but is still one of the lower temperatures we have seen a CPU run at in a notebook.
The S7 produced a sound level of 36 decibels, making it one of the quietest notebooks we have had the pleasure of reviewing and the same as its brother, which is something we would expect due to their similarities. Our measurement is taken in front of the laptop at roughly head level. For comparison: 30dB is a totally quiet nighttime in the desert, 40dB is whispering, and 60dB is a normal conversation.