It is the BittWare CVP-13 that operates on Xilinx Virtex UltraScale+ VU13P 2E FPGA. The CVP-13 is either passively air-cooled or liquid-cooled to ensure maximum efficiency, CVP-13 has been specifically designed for mining cryptocurrency. The units are provided to customers with the security code encoded on them. The key grants access to other private bitstreams. Important Note Important Notice: This is a pre-sale item that is scheduled to be shipped at the close of November, and could experience delays. Additional batches will be available for shipment starting in December. The sale is final for all purchases. mining has been so easy!