Models 72661, 73661 and 74661 are members of the Cobalt® family of high performance CompactPCI boards based on the Xilinx Virtex-6 FPGA. They consist of one or two Model 71662 XMC modules mounted on a cPCI carrier board. Model 72661 is a 6U cPCI board while the Model 73661 is a 3U cPCI board; both are equipped with one Model 71661 XMC. Model 74661 is a 6U cPCI board with two XMC modules rather than one. These models include four or eight A/Ds, four or eight multiband DDCs and four or eight banks of memory.