Deltacast offers a range of PCIe video I/O cards. Their SDI PCIe cards offer a high-density of ports in various form factors. Nobody offers a higher density of SDI ports per PCIe card than Deltacast. Cinegy has certified Deltacast products for use with Cinegy products such as Cinegy Air (playout), Cinegy Multiviewer (multiviewing) and Cinegy Capture PRO (real-time SDI ingest).
The Deltacast also has interesting HDMI and ST-2110 I/O cards worth looking at.