So, if you want to shoot in the continuous mode or 4K videos, buying a fast card is always worth it: Fast write speed provides a fast buffer clearing time between burst shots optimizing your shooting experience. Fast read speed can let large files such as 4K video or a bunch of high-resolution images by continuous shooting transfer to PC in seconds. And, please stick to 64GB or 128GB (or larger) SDXC cards for the best video codex.
Below are our top recommended SD memory cards for Olympus E-M1X mirrorless camera. Just choose the one you need.