Thanks kilo17.

When you say Pro Duos are best in linux do you use the FirePro workstation drivers (Ver 15.302.2001) or the AMDGPU (Ver 16.60) drivers?

I'm looking at 2400 watt of Platinum 12v PSU for the 4 x Pro Duo cards and ~500 watt ATX supply for the motherboard.

What miner are you using to get 980-1050 sol/s on ZEC?

Can you explain further re card placement on mobo.
I'm planning to use a MSI X99A SLI PLUS Motherboard with all 4 cards in the 4 PCIe 3.0 x16 slots. 3 will be mounted directly and the 4th via a PCIe x 16 riser ribbon.

I'm glad to hear that this can all be made to work and that you're getting excellent ZEC sol/s.