The C900 uses an unnamed AMD GPU with 4GB of GDDR5 memory and has nine Mini HDMI outputs. There are no details about power consumption, but given the lack of PCIe power connectors it should be under the 75W that can be provided by the PCIe slot.
No details are shared about how much this thing will cost but I expect it will be in the $800 - $1,000 range.
The Matrox C900 is a single-slot, PCI Express® x16 graphics card that drives nine, six or three displays or projectors at resolutions up to 1920x1200 per output. A special-purpose card designed to power 3x3 or 9x1 video walls, Matrox C900 runs in stretched desktop mode and delivers a single, ultra-large surface across all attached displays, ideal for digital signage, presentation, and video wall applications. Combine two C900 cards to drive 6x3 or 3x6 video walls from one system, with the board-to-board framelock feature ensuring all displays are synchronized to reduce tearing. Matrox C900, with its high reliability, outstanding performance, and low-power consumption delivers a cost-effective video wall solution for enterprise, industrial, pro A/V, digital signage, security, control rooms, and more.