SIGGRAPH 2015 provides a 16:9 aspect ratio for all session rooms. All screens and projectors are 16:9, so to take advantage of the wide-screen format, you will need to create your slides in 16:9. Please note that it is not mandatory to use the 16:9 format, but if you do not, your slides will appear "pillar boxed".
SIGGRAPH 2015 provides a generous array of presentation technology in the technical session rooms. The standard setup includes a screen, a high-resolution video/data projector, a standing lectern, a laser pointer, two head-table microphones, lectern microphone, wireless lavaliere microphone, a Windows PC, and a Macintosh.
All the computers are connected to a switcher at the lectern that feeds the high-resolution video/data projector.