GeForce RTX 3000 graphics cards were the first to receive the latest GDDR6X memory produced by Micron. This memory is designed to run at speeds up to 21 GHz, but even in the RTX 3090 it runs at 19.5 GHz. It seems that we now know what the reason is.
The source specialist ran tests on the RTX 3080 and found that the hottest memory chip was heated to a very impressive 104 C (degrees on Celsius). Although Micron has stopped specifying temperatures for its memory chips since GDDR5, this is still a very high temperature anyway.
According to certain data, for GDDR6X, the temperature of 120 degrees C is probably considered critical, and the maximum operating temperature can lie between 105 and 110 degrees. That is, in the RTX 3080 memory can be heated to the maximum temperature allowed for it, and this is not very good. Probably increasing the frequency to 21 GHz would lead to even more heating and trottling, which in this case is also possible.
It should be noted that 104 degrees C is the maximum temperature, but it is impossible to know on what chip it was reached. Combining this data with an IR photo of the board, we can conclude that we are talking about one or more chips located to the right of the GPU near the board’s power subsystem elements. Elsewhere, the temperature of the chips seems to be about 20 degrees lower.