Making a 2-chip USB miner is not difficult at all, but the tricky part is how do you provide the power required by this miner? Our DM miners was designed using BUS power scheme, which means the miner is powered from USB2.0 bus (or USB2.0 cable). Now, the USB2.0 specification only provides up to 2.5W (or 500ma current at 5V) power to one USB device, so that will put 2-chip USB miner out of the power supply range of USB2.0 bus.