... x1,4*PCI socket, Special for Surveillance Markets. Realtek ALC653 6 sound channel, AC97 audio ... B. Big board design, special for Surveillance Markets.This board provide full speed graphic card ... COM, support 40 channel audio& video collecting and I/O, suit well of demand for Surveillance Markets ... the demands increase every day. Before surveillance markets usually use intel 865 chipset of DVR ...