Ultra M.2 PCIe Gen 3 side effects?

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Question:
 1. Would a single Graphics card x16 become reduced to X8 using 1 or 2 of these Ultra M.2 Slots(x4)?
 2. If running in x8 PCIe would the GPU take a performance hit? Currently, I'm using a 780 on a PCIe 2.0 x 16 slot which is the same thing.

I'm looking real hard at the Asrock Extreme 7+ which offers 3 X Ultra M.2(PCIe x4) slots.

 Triple Ultra M.2 32 Gb/s (PCIe Gen3 x4 & SATA3)

 The PCIe Gen3 x4 Ultra M.2 interface pushes data transfer speeds up to 32Gb/s. In addition, it also supports SATA3 6Gb/s M.2 modules, and is compatible with ASRock's U.2 Kit for installing some of the world's fastest U.2 PCIe Gen3 x4 SSDs.

 The Secret of Ultra M.2

 Ultra M.2 is one of ASRock creative innovations. Compared to normal M.2 with PCIe Gen2 x2 bandwidth, ASRock is the first one in the world to double the M.2 bandwidth to PCIe Gen3 x4! Furthermore, the layout of Ultra M.2 is also specially designed. On a regular motherboard design, the signal route starts from the M.2 device, goes through the onboard chipset, and finally reaches CPU. In contrast, by connecting the M.2 interface to CPU directly, ASRock Ultra M.2 has lower latency and pushes the I/O speed to a new level.