I'm seeing people recommending or using 90+MB/s SD cards left and right. "UHS-type memory cards are not compatible". According to Nintendo. But maybe the hardware is capable of UHS speeds and it just needs to be enabled via software? (I doubt it, but it would be really nice!) And yes, I know any SD will work, but if UHS isn't supported the speed limit goes down to the standard SD speed of 25MB/s max. http://en-americas-support.nintendo.com/app/answers/detail/a_id/1263/~/what-sd-cards-are-compatible?