There were 2xNVidia GTX780Ti used in this study, having in total a combined 5760CUDA cores (2880 each), running on a machine 2 x Intel Core i7-4960X @ 3.60GHz and Corsair DOMINATOR Platinum Series 64GB DDR4 DRAM 2800MHz.
References:
[1]Emergence: The Connected Lives of Ants, Brains, Cities, and Software by Steven Johnson
[2]The Myth of the Framework: In Defense of Science and Rationality by Karl Popper
[3] Bonabeau E., M. Dorigo, G. Théraulaz. Swarm Intelligence: From Natural to Artificial System s. Santa Fe Institute in the Sciences of the Complexity, Oxford University Press, New York, Oxford, 1999.
[4] Chialvo, Dante R., Millonas, Mark M. “How Swarms Build Cognitive Maps” . In Luc Steels (Ed.), The Biology and Technology of Intelligent Autonomous Agents , (144) pp. 439-450, NATO ASI Series, 1995.