Hey guys and gals, hope everyone is having a great day. So I ordered everything to get my first mining rig and have a question. I have a ASRock H81 PRO BTC R2.0 motherboard and (2) MSI 480 gaming x GPUs. I know the board has a molex connector to help power the pci ports, but my question is do I need to power all the risers and use the molex on the board or just use the powered risers by themselves?
Thanks, yea I really only got into mining like month and a half ago. Started with burst and then found out about Zcash and having been mining it on my gaming computer, but wanted more. Mining is addictive! I can't wait to get some more cards when funds work out.
I'd recommend non-powered risers with that motherboard since if you are plugging in the Molex to the motherboard then you're good. Adding powered risers to that can be asking for trouble as you may inadvertently put too much power on the PCI-e bus.
So many noobs use USB risers on that MOBO with the molex connector plugged in to the motherboard which is wrong.
Either use the PCI-e powered risers and DON'T plug the molex into the motherboard or use regular risers with it and plug the molex into the motherboard but doing both is dangerous.
To see how wrong this is, note that ASRock actually makes a riser for this board that does not include a power connector.
I'm not sure how using powered risers and molex connectors could be dangerous. The card will only draw as much current as it needs. You can't over power it. You'd actually be splitting the load across two separate cables therefore decreasing current draw across a single cable, which would actually be safer than drawing the current across one.
Just so you know I'm talking about using powered risers while also powering the molex connector mounted on the surface of this particular motherboard which is used for essentially the same purpose as the powered risers. Too much power on the PCI-e bus is dangerous.
Which does not make sense. You dont put in "more" power by just connecting the cables. You just give the hardware more supply if it needs to draw more power which could be delivere through the molex connector only.
If the draw is higher than the supply, you melt the cables.
There is no such thing as putting too much power on the PCI-e bus. It would be the same as using either a 500w psu for instance or using a 1500w psu. It's too much current draw that would cause damage.