Re: Power Supply Ports

Splitting an 8-pin PCI-E connector to dual 8-pins is not recommended. That's a good way to overload the PSU cable and rail with up to 300W. That PSU has 4 PCI-E ports. With 3 cards and 6-pin risers, you can use 3 PCI-E ports for the VGA 8-pins and use a 8-pin to dual 6-pin splitter cable to power two of the the 6-pin risers. The last riser can be powered with a 4-pin molex to 6-pin adapter cable.

https://www.aliexpress.com/item/20CM-Black-Sleeved-8-Pin-PCI-E-GPU-to-Dual-8-6-2-Pin-Splitter-PC/32688175733.html?

https://www.aliexpress.com/item/Carprie-New-ATX-IDE-Molex-Power-Dual-4-To-6-Pin-PCI-Express-PCIe-Video-Card/32820268682.html?

This is safe bot to me thats way below what this psu can deliver. There's 4 pcie slots and a max power rating of 750w/62.5A at 12v, so thats 187.5w from each pcie port safely with should be much higher. using 2 570s with undervolt from one output is not an issue based on corsair standards.

Except that it's not. For one thing the total capacity of the PSU has nothing to do with the maximum rating of the individual ports or the cables. RX 570's even undervolted, mining Equihash or dual mining can easily use 100-110W each from the VGA 8-pin. In the best case, that's 200W+ from one cable. Depending on the gauge of the wire used for the cable you would be far exceeding the the rated capacity of 18 AWG cable, which is 10A or 120W max at 12V. If 16 AWG cables are used, you would still be drawing over 200W from one PSU connector and it's NOT safe, especially for use in a mining rig under constant load 24/7.

http://www.rowand.net/shop/tech/wirecapacitychart.htm

This I agree as wire used is very impt, got to consider cable load and psu load simultaneously. So I always make sure the cables are of quality build. As the op is stating corsair, in my own experience cables are of no issues. Been using corsair especially the hx1200 extensively, abusively at times but they held up well. Cool

"Depending on the gauge of the wire used for the cable you would be far exceeding the the rated capacity of 18 AWG cable, which is 10A or 120W max at 12V."
And dont forget, pcie using 3 +12v wires not 1. So theres no issue if u calculate it right.