Data Transfer Speeds (in MBps)
We measured data transfer speeds of up to 90 MBps in read mode and 22.5 MBps in write mode. The read speeds clearly rival the Sandisk card, but the same can't be said of the write speeds. The Sandisk card writes data almost four times faster (81 MBps).
In other words, it takes 1 minute and 30 seconds to copy 8 GB of files off the Sony SF8UX, and 6 minutes and 5 seconds to write the same files back onto the card.
With performances like this, the Sony SF8UX is aimed at users with compact cameras compatible with the UHS-I standard (which are still quite rare).