GeoVision 4 Channel HD-SDI Hardware-Compressed H.264 DVR Card: PCI-Express, 120 fps @ 720P or 1080P, 3yr warranty Up to four GV-SDI-204 Cards can be connected. GV-SDI-204 Cards can also be installed with other types of GV-Video Capture Cards including GV-900A, GV-800B, GV-650B, GV-600B, GV-1480A / 1240A / 1120A Combo Cards, GV-1480B / 1240B / 1120B Combo Cards, GV-4008 and GV-5016, but the total number of channels cannot exceed 32 channels. GV-SDI-204 is currently not compatible with VIA series and ATI series chipset motherboards. GV-SDI-204 does not support the TV-Out function. To work together with GV-SDI-204, GV-NET/IO Card V3.1 must be set in the I/O Box Mode and connected to the PC through USB or DB9. AGP or PCI-Express, 800 x 600 (1280 x 1024 recommended), 32-bit color