When it comes to SD card performance, we typically expect to see speeds typical of the industry standard of 90 MB/s. You can imagine the look on our faces when we receive a SD card that advertises read speeds of up to 280 MB/s. Ok, so maybe our jaws were touching the floor. That is exactly what happened when the SanDisk Extreme PRO SDHC UHS-II Card showed up at our front door.