Techniques for interconnects structures for a multi-core processor including at least two multi-core integrated circuits include forming at least two multi-core integrated circuits each on a respective substrate into a stack, disposing connections through the stack between a circuit of a first one of the at least two multi-core integrated circuits and a circuit of a second, different one of the at least two multi-core integrated circuits, the integrated circuits arranged in the stack with connections of the first one connected to a receiving pad of the second one.