The SYS_FAN or CHA_FAN headers use a different temperature sensor on the mobo to guide them. The CPU_FAN header concentrates on the temperature measured by a sensor inside the CPU chip. The automatic fan speed control systems in any mobo are based on keeping the TEMPERATURE of certain components under proper control. You should realize also an important fact. Then you can use its tools to adjust the fan headers if you wish. So instead if you install and use the AI Suite tool, it is a Windows app you can run on your screen while doing other work and thus "see" their operations in a "real world" workload. The basic issue here is that you CAN configure fans headers in BIOS Setup and observe their speeds, but you can NOT do that while doing real work. But you should recognize that AI Suite is ASUS' own utility for fan (and other) optimization. I’ve also removed the shroud around the XFX 5700XT THICC2 but that didn’t help as much as anticipated (you can see it is the GPU’s PCB touching the PCH fan).There are lots of models in the ASUS Z390 series, so we're not sure exactly which one you have. Initially, I thought the issue was down to coil whine and replaced the PSU. When gaming it will go above 3000rpm, then it is loud! And also outside as it prevents air moving around the GPU, the fan is actually in the worst possible location as it can only draw air from the heat pocket from under the GPU. The PCH is quite bulky and acts as a heat trap inside the enclosure the PCH will quickly heat to 57c when the fan engages (at 1000rpm ), and goes up/ down 500rpm for every 1c change, so the pitch (fairly similar to a dial tone is constantly changing, I have to use headphones to block the sound).
Worse still is that there is no provision of an air gap for the fan. It boils down to the PCH fan being slightly higher than the maximum permitted in the “Card Slot Area” of 0.6" (15.24mm) as stated the ATX specification. Subsequently, that tab broke off when I tried to remove the GPU (it was quite flimsy). When assembling the PC I noticed that there was a clearance issue with the chipset fan that preventing the GPU from being fully inserted so the locking tab would close, I had to press down on the GPU way harder than I am normally comfortable with. They are simply too high and easily blocked by GPUs, making them run extraordinary hot and loud. There is a height issue with your x570 chipset/ PCH fans.
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