In reality most mining happen with under-clocked GPU cores (and admittedly overclocked VRAM), and at very stable temperatures. The GPU that is used 24/7 for min

In reality most mining happen with under-clocked GPU cores (and admittedly overclocked VRAM), and at very stable temperatures. The GPU that is used 24/7 for mining will be far less stressed than a GPU that is powered on and off, and cycles through a lot of thermal changes throughout the day