tubes for the radiators soften if the miner has temperature over 40C
Thats.... thats just physics...
Physics yeah, for the "quality" of the tubes.
No, that's just how all materials behave when heated. All watercooling tubing is exactly the same material - acrylic. It is ALWAYS going to 'soften' when heated. I'll give you $50 if you can send me acrylic watercooling tubing that doesn't get softer when heated.