Re: [ANN]CureCoin - Earn while you solve cures for Cancer. True 3.0 crypto
I can only think of a few more things that I do, that may or may not help. Make sure crossfire is turned off, disable ULPS in afterburner or in the REG. Check the core clocks, and make sure they are not throttling. Are all your Mobos the same? Check gpuz and see if they are not stuck in pci-e 1 mode. If you are using risers, maybe try swapping them. I am reaching, but i know how frustrating it is to troubleshoot. 
Well after thinking about what Vorksholk said I realized since the GPU's are the same the WU's should be fine even if I move cards in the middle of work so I swapped the cards between two machines. Ironically, the cards that were running at half speed now run at full speed and the cards that where running at full speed are now running at half speed. Clearly the issue isn't with the GPU's.
So I suspected it had to be the PCI settings on the motherboard but GPU-Z shows both machines are set to PCI-E 3. Crossfire is off on those machines, ULPS is disabled and the clock speeds seem to stay at 940 which is where I have them set. The GPU's are placed directly on the motherboards so there are no risers.
I really have no idea what else it can be at this point. I'm wondering if I have a bad motherboard. All the motherboards are the same as well. Actually every component is identical in the computers.
Still sounds like a hardware issue so I'm going with your mobo is busted somewhere.