SanDisk 64GB Extreme Pro microSDXC V30 A2 UHS-I/U3 CL10 TF Memory Card with Adapter, Speed Up to 170MB/s 90W SDSQXCY-064G

Overall Review: Did speed check on my Desk top and found Red speed only 19.2 MB/S, and Write only 18.2MB/S. Notified Customer service for return. Got email from 3C Expert (an online e-commerce driven business). Asked me to check with USB 3.0 port. My Desk top has only USB2.0 port. Recheck speed with my Lap Top with USB 3.0 port speed read and write went up to 85 MB/S and 56 MB/S. Decided to keep my order. Thank you 3C Expert

Overall Review: Not at all the speeds advertised, I got the same results from a class 10 u3 gskill SD card. I used a 3.0 usb card reader built into an HP Elitebook to transfer files to using exFat but the LG phone I put it in didn’t like that formatting it to Fat32 which dropped more speed. I suspect one may arrive at the advertised speeds if one uses a 3.1 usb reader and connected to a 3.1hub. Otherwise it’s just a high priced SD card.