As you may see in the screenshot, the setting is set to 1800 MHz but the current clock speed is 200 Mhz. However, even at 1800, the system crashes after 12 hours.
I started testing from 1900 MHz, and after a lot of hit and trials, I ended up at 1800. So, I tried testing it by manually overclocking the VRAM and undervolting the power to -20%, while leaving everything else at their default settings. Here GPU3 is an overclocked Gigabyte 5700XT