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5x MSI Radeon RX 570 on MSI Gaming Z170A m5 - Not Working

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At my wits end here..

Specs:
  • 5x MSI Radeon RX 570 DirectX 12 RX 570 GAMING X 4G
  • MSI Gaming Z170A m5
  • Pentium Processor G4500 -- this is a Skylane (I saw that's a requirement)
  • 2x Ballistix Sport LT 4GB Single DDR4 2400 MT/s
  • EVGA SuperNOVA 1600 P2 80+ PLATINUM, 1600W
  • 6-Pack PCI-E 16x to 1x Powered Riser Adapter Card w/ 50cm USB 3.0 Extension Cable

Have tried Windows & ethOS.

Windows will boot with 3 cards, ethOS with 4. The 5th will never run (except this one time, at band camp, when ethOS ran it at half speed).

I have tried the following to debug it:

- Chaning PEG0 & PEG1 to Gen1/2
- Enabling 4G Decode
- Adding a stick of ram (now at 8GB)
- Praying to whom/whatever will listen
- Disabling audio controller
- Windows 10 (with driver hack) and ethOS base clocks/mem
- Checked all risers


None of this has worked. I haven't even gotten to OC the cards yet.

Has anyone had similar issues that can help me out of this pit I've fallen into? Thanks in advance!

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