Just got some new tri-x r9 290s and noticed theres a new bios version.  My older cards all run 015.042.000.  

I also noticed that this new version is setting the voltage at 1.055.  I found that this voltage is causing me instant driver crashes and instability.   I used trixx to offset the voltage by 50 and things are much better now.

Good luck out there!

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Not sure if anyone else has the same problem with this board but I finally was about to get 4 gpus to work.  I have seen most can only get 3 due to thunderbolt taking up pcie lanes.   On the latest bios I put all of the thunderbolt options to 0 and for pci-e I disabled gen3 support and increased the latency to 192+.  Disabled any unnecessary usb, sata etc. Also had to short one of the presence pins as seen in the photo.

https://i.imgur.com/SEoMT0e.jpg

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