A modular programmable data processing system, developed by the CASPER group of the University of Berkeley, has been adopted for BEST demonstrator. This system is composed of a 1.2 GS/sec A/D converter for each receiver connected to a serializer board (Ibob) that can host up to 4 A/D boards. At present the configuration of the Bee2 FPGA cluster, offers approximately 500 Gop/sec. This provides enough computation power to implement a full 32 stations correlator. A beamformer for the BEST pathfinder is just under development.