btw heres a link to molex's website for sata crimp terminals and on there spec sheet youll see it says 1.5 amps which equates to NOTHING close to 75 watts on 12v
It's 1.5 amps per pin x 4 = 6 amps x 12 = 72 watts.
current rating
1. Mount the connector to a test PCB
2. Wire power pins P1, P2, P8 and P9
in parallel for power
3. Wire ground pins P4, P5, P6, P10 and
P12 in parallel for return
4. Supply 6A total DC current to the power
pins in parallel, returning from the
parallel ground pins (P4, P5, P6, P10
and P12)
5. Record temperature rise when thermal
equilibrium is reached
1.5A per pin MINIMUM. The temperature rise above ambient shall not exceed 30 °C at any point in the connector when contact positions are
powered. The ambient condition is still air at 25 °C.
http://www.molex.com/pdm_docs/ps/PS-67490-002.pdfIf it was only 1.5 amps, there would be no reason to develop something that will get burned, everything would fry, reason things get burned are that some stupid miners put 2 gpu's in one connector with spliters, also miners need to pay attention to the temperature and where they put the cables, many stupid miners just put them where the heat from the gpu is coming out, so yes sure it will get burned after a long period, also room temperature is important.
The problem with that assumption is that the test procedure was written to stress the connector to make sure it does not fail, it is not indicative of is normal operation. Case in point, all of the pins they are saying to wire in parallel for power to test with are specified for 3.3VDC and 5VDC lines in production.
Pin Description
1 +3.3 volts
2 +3.3 volts
3 +3.3 volts
4 ground
5 ground
6 ground
7 +5 volts
8 +5 volts
9 +5 volts
10 ground
11 ground
12 ground
13 +12 volts
14 +12 volts
15 +12 volts
There are only 3 pins designated for +12VDC (which are pins 13, 14, and 15) so that only makes 3 X 1.5 X 12V = 54 Watts available under maximum load on the 12V rail. There are also 3 - 5VDC pins for 22.5 watts and 3- 3.3VDC pins for 15 watts of additional power at those respective voltages. So while one could add all these wattage values up (54+22.5+15) to claim that the SATA connector can provide ~90 watts of power, without the context of associated voltage levels it is meaningless.
Since most of the SATA power adapters for risers that I have seen seem to only include the 12V rails, the actual maximum power ratings for these adapters in my opinion would only be 54 Watts@12V.