If you are using EWBF you can use the --cuda_devices tag and assign GPU's to that instance.  ie:  --cuda_devices 0 1  would assign two cards, (devices 0 and 1) to that instance of EWBF.

The bar has been raised!!! 

Equipool added 4ksol and I added another 4 x 1080ti for a total of around 7.6ksol.

Thanks for helping out.