When testing the video card, popular diagnostic utilities registered a constant value of 255°C for Hot Spot, which of course did not correspond to reality.
Wizzard, a technical reviewer for TechPowerUp, who develops CPU-Z, noted in his review that NVIDIA removed the Hot Spot sensor for Blackwell solutions, leaving access to GPU and memory chip temperature monitoring. There has always been some "drama" around the Hot Spot indicators, although it was useful for diagnosing the efficiency of a cooler or water block.
Wizzard confirms that Hot Spot metrics are currently not available through the NVIDIA API, so in the next version of GPU-Z, this option will be disabled for RTX 50.
Let us remind you that the Hot Spot value reflects the temperature not of a single sensor, but of the hottest spot on the GPU chip, which is selected from a whole array of sensors. Why exactly did NVIDIA decide to disable the option to monitor this parameter? Perhaps the developers don't want to see high enough values that could potentially confuse video card owners.
During the review of the GeForce RTX 5090 Founders Edition, it turned out that the GB202 heats up to an average of 77°C under load. So, it's likely that the Hot Spot indicator in this case could be close to 90°C. Not a very attractive value, given that we are talking about normal operation without additional acceleration.
At one time, on the reference GeForce RTX 4090 Founders Edition, the AD102 GPU heated up to an average of 66°C, while the Hot Spot value was 74°C.
It will be interesting to see NVIDIA's official position on disabling Hot Spot monitoring on RTX 50 line graphics cards.