It certainly looks like it has all the known requirements of 4x4, ticks the boxes et..... We know 4x4 is using the socket F platform, and this mobo certainly has the PCI-e slots to handle multi GPU and multi PPU....
http://www.tyan.com/products/html/thundern6650w.html
http://www.tyan.com/products/html/thundern6650w.html