theoretically capable of 300 megabyte per second transfer rates, we knew SDXC cards wouldn't stay slow forever. How will we separate wheat from chaff when faster models do appear, though? You're looking at it. This week, the SD Association unveiled the UHS-I specification for SDXC and SDHC cards capable of transferring data at up to 104 megabytes per second -- reportedly fast enough to record HD videos in real time. Why the association chose the phrasing "up to" is a little iffy, as we thought the point of such specifications was quality control, but considering how many Class 4 and Class 6 SD cards we've tossed that didn't match up to spec, we suppose we'll make do with a ballpark estimate... until the inevitable UHS-II makes the rounds. PR after the break.