Have you set it to gen1or2 pcie in the UEFI? Have you started woth stock clocks for the cards and got it running first? Are you using MSI afterburner to adjust clocks? What OS are you running? What memory do the cards have (download gpu-z to find out?
We have them set to gen1 in UEFI. Yes we have not adjusted the clocks although I have MSI afterburner on there but looking for optimal overclock settings. We are running Windows 10. The cards are 6gb.