Hi all,

I have some Sapphire RX580 Pulse 8GB cards with a custom bios. PSU is HXi 1200 from Corsair. 6 of them are connected through 006C risers and the risers get their power directly on their 6-pins using Corsair's cables and some good quality splitters I got. It's basically one0 6 pin from the PSU cable, to one 6 pin to 2 - 6 pin splitter that only power the risers. The GPUs all have their own power cables.

I tried adding the 7th GPU, which had it's own cable for the GPU and from the same cable, it also powered the riser (the PSU cable had two 6 pins). Trying to start it, it fried the mobo (MSI Z170A Gaming M5). I thought there was some kind of bad luck, so, I used some of the mobos I had for the next rigs, I changed the PSU cable and the riser, but trying the same thing on two more Gaming M5s, resulted in the same thing. They get fried. Along with them, it killed the DRAM, the disk and also the CPU. The CPU wasn't completely fried but it wasn't functioning properly so I had to write that off.

Does anyone have any clue what might be happening? I'm afraid to try again as I fire I'm going to fry more stuff. Any ideas are welcome.