The “Computing On Kepler Architectures” (COKA) is a computing cluster funded by the University of Ferrara with the contribution of INFN. The cluster has four computing nodes, each powered by 2 8-core Intel Xeon CPUs and 8 dual-GPU K80 NVIDIA accelerator cards. The nodes are interconnected with two network-interfaces to an Infiniband switched network. The peak computing performance of the cluster is in the order 100 Tflops. This system is intended to support applications development, optimization and test of research groups of University of Ferrara and INFN active in the fields of computational physics, parallel algorithms, and numerical simulations.