The maximum PCI-E specification of a PCI-E 8-pin connector is 150W, not 360W. The maximum specification for a 6-pin PCI-E connector is 75W.
The PCI-E specification is not just based on wire gauge. It's also based on power delivery. Wires and connectors have resistance. The voltage drop and power dissipation as heat increase as you increase the current. The resistance of connectors also tends to increase as they are plugged and unplugged so after enough uses they can overheat and even melt when passing a large current. Which is why it's NOT safe to overload a 8-pin connector with more than the rated specification. ESPECIALLY for a mining rig under constant high load 24/7.
The PCI-E specification is not just based on wire gauge. It's also based on power delivery. Wires and connectors have resistance. The voltage drop and power dissipation as heat increase as you increase the current. The resistance of connectors also tends to increase as they are plugged and unplugged so after enough uses they can overheat and even melt when passing a large current. Which is why it's NOT safe to overload a 8-pin connector with more than the rated specification. ESPECIALLY for a mining rig under constant high load 24/7.