The Acorn CLE series was created to boost GPU performance by offloading parts of crypto hashing onto a Xilinx fpga in a M2 socket form factor. So far the Acorns have been used as standalone miners with the Acorn miner alpha software.
GPU acceleration will be enabled with the upcoming release of the SQRL miner. First version of the miner is scheduled for release 14th of February. Linux version will be released first and windows version will follow shortly after.