SD Cards speeds measured using Blackmagicdesigns disk speed test using the iMac Pro SDXC UHS‑II card slot conveniently located on the back of the monitor:
- Lexar 128GB U3 2000x 300MB/s SD card II has a write speed of 175.2 MB/s and read speed of 254.1 MB/s.
- Sony 128GB SDXC UHS-II has a write speed of 182.4 MB/s and read speed of 256.5 MB/s.
- 64GB SanDisk Extreme I U3 – W:55.4 R:43.3
When using thePro Grade USB-C card the speed drops
- Lexar 128GB U3 2000x 300MB/s SD card II W:39.7 and R:43.2 – no idea why its so slow
- 64GB SanDisk Extreme I U3 – W:38.9 R:43.3
When directly connecting the Sony A7RII via USB-C – Mass Storage Mode
- Lexar 128GB U3 2000x 300MB/s SD card II:11.7 R:31.8
- 64GB SanDisk Extreme I U3 – W:9.9 R:31.9