Hi Victor! Thanks for your post! VIDEO CARDS: The system requires only standard VGA graphics. I can't imagine there would be a problem. Most of the interface is web-based, accessed from a desktop computer, so we don't have extensive requirements. CABLEMODEMS: We work great with cable modems. Version 3.0 that will be released shortly (it's out on beta now) even has support for dynamic IP addressing (DHCP) on the external interface. Regards, Kim