Intel SoC design, but the spec on it claims it only has 4 PCI-E 2.0 lanes (and it doesn't USE a "chipset" so it's not able to gain any from that).

 I'd guess they're using a multiplexer chip to get the extra lanes for the M.2 socket some of the PCI-E sockets.


 Spacing is a bit tight, but doesn't look much if any worse than most "2-5-7" motherboards between the first 2 cards.