Announced back in January, now available is the ASUS Z270-WS. Z270-WS has four PCI Express x16 slots, protected by reinforced PCIe slots and is able to carry up to four dual-slot graphic cards.... ASUS Intros Z270-WS Workstation Motherboard
But it has "Realtek S1220A and Crystal Sound 3. And with newly-added DTS Headphone:X Technology, the Z270-WS delivers flawless audio with immersive 3D surrounding sound". We all know that's what matters for a serious workstation board.