They are 3 pin fan connectors. I solder them on my N64 boards when I trim to have a quick way of testing. I just left them on when I finished the build. I should have added more for the other connections.
Thanks! Like I said I'm reposting it to show case the video. Seeing as I'm not really able to do any real builds at the moment. I edited it to be like Tchay's Envision Gamecube portable video but when I watch the beginning I realize it starts like a half ass slide show video D: