The Lexar UHS-II card will read at 153MBps and write at 71MBps, while the SanDisk Extreme Pro will read at 279MBps and write at 217MBps. For example, if you look at the picture above, the 128GB Sony UHS-I card will read at a dismal 45MBps and write at 36MBps on the Dell XPS 15 9500. Our final takeaway is this really matters only if you care about performance: to have a fast SD card reader in your laptop, and feed it with a fast SD card.
Run a UHS-II card such as the 128GB SanDisk Extreme Pro, which can hit 300MBps, or even the Lexar card which can reach 150MBps. The speed of your laptop’s SD card won’t matter if you only feed it slow 40MBps cards like the 128GB Sony UHS-I card below. It’s just not clear that the standard will matter if card makers skip UHS-III cards for SD Express. Some new laptops have touted UHS-III support as a bullet point, and to be fair, the Dell XPS 15 9500’s UHS-III reader on the PCie 3.0 bus was consistently the fastest in our tests. The third recommendation is not to get too caught up in wanting UHS-III. So just buy a verifiably good external reader and don’t look back.
But you just don’t know what level of card reader you’re going to get, even on new laptops.
We’ve talked to content creators who see a lack of an onboard SD reader as a reason not to buy a particular laptop. The second takeaway is, stop turning up your nose at USB card readers. All four of the laptops we tested are current models introduced this year, yet we see a huge swing in performance. The first takeaway from this is that clearly, not all laptop SD card readers are created equal. Gordon Mah UngĬontent creators hate using external readers, but a fast USB 3.0 reader such as this SanDisk Extreme Pro reader is probably faster than your laptop’s reader.
And remember: 34GB seems like a large file, but that means 90GB of video files would take probably 45 minutes. The Dell and its USB 2.0-bound card reader takes a painful 15 minutes to do the same task. The Xenia 15 takes about five additional minutes to copy over. It takes a little over two minutes with the and Aero 17 to copy a 34GB file to the desktop. With a file this large, we now see why having a high-speed SD card reader is so valuable.
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