You can certainly use your UHS-I card and depending on how you shoot it may be fine. Theoretically UHS-I can transfer at 104 MB/s while UHS-II can transfer at 312 MB/s. Of course we don’t really hit those limits. In testing with the R7 your SanDisk Extreme Pro UHS-I did 74 MB/s and their UHS-II was at 166 MB/s. The fastest card tested was the Kingston CANVAS React Plus at 185 MB/s. What this came down to is that with your current card shooting raw at a 30fps burst will get 39 shots before hitting the buffer and it will take 17.33 seconds to clear the buffer. The UHS-II will get 41 shots with 7.15 seconds to clear and that Kingston card will do 41/6.2. So depending on how you shoot your card may be fine. If you’re not shooting long bursts you might not notice the difference. Also if you do much video you might want to upgrade. And if you do decide to go UHS-II be careful and don’t go cheap. Some of those UHS-II cards that are rated 270 MB/s or less will actually perform no better and possibly worse than your card. The Sony and Lexar cards at around $30 tested slower than yours. As for transferring from card to computer, Amfoto is right. You can upload your photos 3 times as fast BUT only if you have a card reader that supports it. There still aren’t a lot of built in readers that support the speed and if you use an external reader you’ll only get that benefit if it’s a USB-II reader.