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The Cray XK7 is an enhanced and upgradeable version of the Cray XK6 supercomputer, announced in October 2012. The XK7 uses the same "blade" architecture of the XE6, with each XK7 blade comprising four compute "nodes". Each node consists of a 16-core AMD Opteron 6200 processor with 16 or 32 GB of DDR3 RAM and an Nvidia Kepler K20 GPGPU with 6 GB of GDDR5 RAM, the two connected via PCI Express 2.0. Two Gemini router ASICs are shared between the nodes on a blade, providing a 3-dimensional torus network topology between nodes.

An XK7 cabinet accommodates 24 blades (96 nodes). Each of the Kepler processors is rated at XXX double-precision gigaflops giving XXX teraflops per cabinet. The XK6 is capable of scaling to 500,000 Opteron cores, giving up to 50 petaflops total hybrid peak performance.

The XK7 runs the Cray Linux Environment. This incorporates SUSE Linux Enterprise Server and Cray's Compute Node Linux.

The largest installed XK7 system is the "Titan" system at Oak Ridge National Laboratories. Titan is configured with 18866 compute nodes and over 25 Petaflops of peak performance