I've got some Gigabyte ga-z97x gaming 3 boards that work with 6 cards and an m.2 ssd installed. The Biostar TB250 that is coming out can probably do this too.
Is it possible to use the m.2 slot for another graphics card with one of these adapters?
http://www.microsatacables.com/pci-e-1x-4x-card-to-m-2-m-key-4-lane-pcie-slot-adapter
Comments
The easiest way to find out is to buy an M.2 to PCIe converter (search Amazon for m.2 to pcie) and try it out.