X99 with 2 m.2 slots
X99, SLI, and M.2 RAID 0 ... according to the manual, the 750 should work simultaneously with the m.2 slot in the x8/X4 slot since it's only an x4 device.
Gigabyte GA-X99-SOC Champion LGA2011-v3 DDR4 Motherboard EATX… DDR4 memory modules are available at a stock frequency of 2133MHz, but memory vendors encode XMP profiles which can automatically modify the frequency and timings of the supported memory modules to work in par with your CPU. JSComputers.cz -- Asrock X99 Extreme4 - S2011, Intel X99