Hi, i just buy a sd extreme pro and i very surprised that only write to 19.78mbps and read 19.78mbps just like any other card. This is ok or my extreme pro is failed?
You tested the card on a computer? Are you using a USB3.0 card reader?
Card reader, background process, USB port, and even your HDD.
All these things will affect the test result.
I have an Ultra 16GB card. I tested the card on two different card reader, a USB2.0 card reader and an SDDR-289.
And the test results are different.
Maybe my experience could be helpful on your issue.