What are you planning to mine (what algorithms)? What is your goal? How many and what type of GPUs? How big is your space?
I am not a big fan of low cost self made rigs, that saves you money when you start but in a long term will turn out to be inefficient. Give us some more input data, then this conversation will be more productive.

How about installing the hynix card first? can you do overclocking?

there is this settings in the MSI AB to untick the Synchronized settings for similar graphics card in order to set clocks individually.

I am just wondering on the greyed out issue, that problem is seen in incompatible driver to MSI AB versions, however you've told that its working on 3 gpus so its kinda weird.

I've been running a few mining rigs, which are basically just motherboards crammed with cards.

Due to heat problems, I've been looking to get some risers - and they finally arrived. I got 100 cm flexible USB cable risers, with SATA power. They look impressive 3 filter caps and a VRM on the riser board.

Anyway, the first thing I found was that no cards would be detected on the risers until I set the mobo BIOS to PCI-e v1.0.

So far, so good. So, one at a time, I transferred cards from mobo onto riser cables, and after a few false starts, I had 2 cards running on risers, and 1 on the mobo.

That's when I start to get adventurous, and connect a 4th card to a 1x PCI-e slot, and power it via a 2nd PSU. All the connections are double checked. The riser is in the slot the correct way round, etc.

Link the PSUs with a dual PSU adaptor, and power up.

*Sizzle* *Pop* *Crackle* Cue sparks and smoke rising from the 1x PCI-e slot. The mobo is totally dead.

I recheck all the connections, and they are definitely correct.

Thinking I made a mistake, I decide to have another go.
This time, I connect directly a 1x PCI-e slot with a 4th card, after triple checking everything.

*Sizzle* *Crackle* Sparks. Another motherboard now dead.

I don't get it. I've built dozens of PCs in the past, and built a heap of mining rigs, albeit without risers. I've done dual PSU before.

What could have happened? What was cause sparks and sizzling and burn out a mobo. I've looked at the PCI-e riser design, and the power pins are not connected on the riser, so I don't see how a power surge or something could have come from the 2nd PSU back feeding the PCI-e slot.

Any ideas? Could it be a bad riser card? I've run a multimeter over it, and there don't appear to be any shorts or anything. I'm completely baffled.

I'll go with Vann's advice, even you manage all cards to be working on one Rig this is not practical for since it has a centralized failure, mining is not a 100% reliable all the time of the day, if any of the GPU's, PC components, Softwares or even connectivity failed, your profits will greatly reduced.

Also, each RX470 will draw 180-190w  in dual mining, 4x650w PSU in 18GPU is not sufficient to power them all

I used the blockchain driver. what did u exactly do ? I installed vega first then tried 570 first. i tried both on pcie 16 on mobo. no luck.


which version of windows 10 u using ? Im using windows 10 fall creators update.

I'm running a 470, 480, 570 and vega 56 all on the same rig.  I just installed the blockchain driver.  Perhaps you have a riser problem.

the same things I experienced. I started to check on the motherboard, PCIe USB raiser, Driver and type windows. I use window 10. then Problem was Solved