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The X6500 FPGA Miner is an FPGA coprocessor, utilizing dual Spartan-6 FPGAs for minimum cost and maximum power efficiency. It is optimized for Bitcoin mining, but can be adapted for other applications.
Typical perfomance achieved is 400 MH/s. Power consumption has been measured as low as 15 W. Because this is such a small amount of power, it can be easily kept cool with a single, low RPM fan for a nearly silent mining rig.
Please see the individual product pages for more stats: