RX 580 2x15 pin SATA to 8 pin cable power adapter safe for mining?

[neet-o]

Hi, I'm running 8x RX 580 rig and my PSUs only come with 2x 6+2 pin and 1x 6+2 + 6+2 pin cables so I need to figure out the best way to connect the remaining 2 cards.
Found this adapter on Amazon: https://www.amazon.co.uk/gp/aw/d/B007Y8FSMQ/ref=mp_s_a_1_1?ie=UTF8&qid=1501028410&sr=8-1&pi=SL75&keywords=Sata+to+8+pin
It's probably ok for general use and maybe gaming but is it ok for mining? Is anyone using one of these?

[1715664654]

1715664654

[neet-o]

That was my conclusion as well. But what is the reasoning - is there a chance they'd melt or something or would they not provide full 150w?

[Arek]

sata is rated at 54W so with two sata plugs you are still far from 150W which 8pin pcie is rated.

[adaseb]

That was my conclusion as well. But what is the reasoning - is there a chance they'd melt or something or would they not provide full 150w?

You are not even suppose to run the riser off the SATA power and you want to run a 8pin connector off 2 SATA plugs?

[neet-o]

Cool, thank you guys, all clear to me now regarding the SATA adapter.
Just 1 more thing is nagging me regarding the 2x 6(+2) pin cable from PSU - it should give me full 300w so in theory I shouldn't have any problems connecting two 8-pin RX 580 cards to a single 2x6(+2) PSU cable.
Any thoughts on that? I know it'd probably be better to have separate 8-pin cables for each card but the PSUs I've got only include 3 cables each (2x 8 pin cables plus 1x 6(+2)pin + 6(+2)pin).

[stoniestfool]

as far as why not to use a sata adapter. They will catch fire and short out. I have seen my nephew do this after I warned him not to. He is slow. I would not connect 2 580's to a single 8 pin connector. I have had evga and Corsair power supplies melt the connection at the psu on a single 480. That was a reference 480 that was running at 150 power limit. So around 250 watts. Even great psu's are not rated for constant use in mind. They handle it for a while but over time you end up with problems pulling the rated currents.
If you were undervolting and only mining eth you may get away with it.

[Apneal]

I'm betting if your PSU didn't come with connectors to connect 8 cards, its wattage isn't rated to run them either.

Do the easy thing and just pick up something like this:
http://www.parallelminer.com/product/hp-750-watt-power-supply-kit-for-gpu-mining-platinum-94-zec-dash-eth/
Or
http://www.parallelminer.com/product/hp-1200-watt-power-supply-kit-for-gpu-mining-platinum-94-zec-dash-eth-2/