https://docs.google.com/file/d/0B83UyWf1s-CdZnFoS2RiU2lJbEU/edit?usp=drive_web [61 pages of slides] Why we need Exascale and why we won’t get there by 2020 Horst Simon Lawrence Berkeley National Laboratory Optical Interconnects Conference Santa Fe, New Mexico May 6, 2013