Issues with 6pin Riser Cables

Hey guys!

I’m currently facing a strange issue and I wanted to see if any of you has a solution for me. I just bought a couple of 6pin male to 6pin male PCIE cables to power my risers. I was trying to hook them up directly to the PSU (6pin peripheral connectors) & the risers. Depending on which PSU I hook them up to I get two different errors:

  • PSU1: System won’t power up at all
  • PSU2: System does power up and windows boots but the GPUs are not detected

That means the problem seems to be either located in the PSU (as mentioned I tried both of them but neither worked) or the cables (tried 4 different ones with the same result). Do you guys have any ideas or did anyone experience the same issue? Just as a heads up, everything works fine when I use the 8pin PCIE slots in the PSU and hook the risers up with 8pin to two 6pin PCIE. I would go with that but I don’t have enough 8pin PCIE slots in the PSUs to power the GPUs & the risers, so its not an option.

My hardware:

PSUs: 2 x

6pin cables:

Risers: PCI-E Riser Express Cable,6 Pack Latest PCI-E Riser Express Cable 16X to 1X (6pin / MOLEX/SATA) with Led Graphics Extension Ethereum ETH Mining Powered Riser Adapter Card+60cm USB 3.0 Cable -

My initial thought is insufficient ground. Have you tried running fewer gpus?

Some cables does not work with certain psu, look at psu end of the cable. Pin location differ. I have Evga psu, it only works with the cables that came with it.