I'm new to mining I need help with setting up GPUs with 750 watt power supply, I have two rx5700 and two gtx1660 6gb can I power these cards safely with the power supply?
Yes it works.
2x 5700xt real power consumption is 130 - 140w per card = 280w if you have bad cards
2x 1660 consumption is 80 - 100w per card = 200w if you have bad cards
+100 - 150w for mainboard,riser and so on.
so your consumption is:
520w - 630w depends on your settings.
Sometimes the rated power may even
exceed the Thermal Design Power.
According to the official GPU specs, the AMD Radeon 5700 (not XT) card
consumes 180 watt, the NVIDIA GeForce GTX 1660 card
draws 120 watt.
Of course, the settings can be adjusted, but there is no information about the algorithms used. The OP also didn't mentioned the model of his motherboard, SDD and other peripherals, so I am assuming their
TDP is 150 watt.
Let's calculate the total Thermal Design Power:
TDP = 150 W + (2 * 180 W) + (2 * 120 W) = 750 W
General rule is 50~80% draw on a rated PSU supply will pretty much make it last forever. The closer you stay to 50% the more efficient and the cooler the psu will run.
Thus, at least 20% of the capacity must remain free, that is, a 750 watt Power Supply Unit should consume
no more than 600 watt for safe operation.
So in this case, GPUs are
really overkill.