I am selling TWO Windforce (AMD Radeon R9 280) GV-R928WF3OC-3GD graphics cards with a crossfire cable, so they together simultaneously. Two standard PCI slots required on your motherboard - other specs are available online. I have shown photos of my display settings to show that they are in good working order and running at the same time. I recommend downloading AMD catalyst control center to ensure your crossfire setting is enabled. Price firm, selling as a lot only.