TechPowerUp got to see two upcoming Socket AM4 motherboards from MSI for AMD's Ryzen at CES 2017, the first one is the flagship model
X370 XPower Gaming Titanium. Design-wise this motherboard will not appeal to everyone, it's a very light colored motherboard with some metallic elements. It uses the AMD X370 chipset, has 10-phase VRM, four DDR4 memory slots, two PCI Express 3.0 x16 slots (x8/x8 when both are used), and a third PCIe x16 that is electrical x4.
The star-attraction, however, is the silvery-white PCB, with matching connectors. The AM4 socket is wired to four DDR4 DIMM slots, and two PCI-Express 3.0 x16 slots (x8/x8 when both are populated). The board supports NVIDIA SLI-HB and CrossFireX. The third x16 slot is electrical x4, and wired to the X370 chipset. Storage connectivity includes two 32 Gb/s M.2 slots, one 32 Gb/s U.2 port, and six SATA 6 Gb/s ports (from which two are directly wired to the processor). The board also serves up four USB 3.1 ports (including a type-C port), eight USB 3.0 ports, MSI's highest-tier onboard audio solution, and gigabit Ethernet that's sourced from either Intel or Qualcomm Killer.
The site also got to see the MSI B350 Tomahawk, which is based on the mid-tier B350 chipset. This model is part of the MSI "Arsenal Gaming" lineup, it has 4+2 phase VRM, has four DDR4 slots, one PCI Express 3.0 x16 slot, and a second PCIe 3.0 x16 slot that is electrical x4.
Two each of legacy PCI and PCIe 3.0 x1 make for the rest of the expansion slots. Storage connectivity includes one 32 Gb/s M.2 slot, and four SATA 6 Gb/s ports. From these, two come directly from the APU/CPU. The board also offers up to eight USB 3.0 ports, gaming grade 8-channel HD audio (with ground-layer isolation and audio-grade capacitors); gigabit Ethernet, and display outputs that include HDMI, DVI, and D-Sub (which will be disabled when using Ryzen).