I soldered a connector taken from a router power supply to the thicker 12V wires.

From what I can read from the label that should go upto 16-20A (268W) so I guess I'm safe and it also has a fan.
(I had a blown up closed power supply from a miner hub this summer when it was 40°C here  and not much less under the roof where the hardware is so some airflow is always nice)

It's been running for about 8 hours now and does 780-850+GH pretty constant on voltage 7 (3 leds on).
The limitation is the usb hub of the pi zero but I'm ok with this speed.
Still better than doing 100GH more and fry your unit after a while.