Integrated circuit (IC) device substrates and structures for mating and aligning with sockets. An IC device may include a frame on and around a substrate, which may include glass or silicon. The frame may include an alignment feature, such as a notch or hole, to mate with a complementary keying feature of a socket. A heat spreader may be coupled to an IC die and extend beyond the substrate or be coupled to the frame. The heat spreader may include a heat pipe. The IC device may be part of an IC system with the device substrate coupled to a system substrate by a socket configured to mate to the frame.