Expensive, but very fast

The current fastest SD memory cards operate on the UHS-II standard. With promised transfer rates of up to 312 MB / s (HD312 mode) these surpass their predecessors in theory to more than 200 MB / s.

Dispensing with a particularly high storage capacity, I've bought a Toshiba EXCERIA Pro UHS-II with 16 GB. The 32GB version costs more than 100 euros, which I then something would be too expensive. The memory card is likely to be used at me for a few weeks, especially for quick and easy exchange of data between PCs and in future also as a storage medium in a digital camera.

Toshiba promises on the packaging a read speed of 260 MB / s and a write speed of 240 MB / s. As usual, those data rates usually achieved only under certain conditions. File size, card reader, operating system and a lot more here, have an impact on the actual possible / achievable performance.

To retrieve a prerequisite to as much of the promised performance, is first of all a fast card reader that supports the UHS-II standard. If this is not the case, usually no data rates in excess of 100 MB / s can be achieved. If the card reader, such as internally even tied in many older notebooks, for example, on a slow USB 2.0 interface, as is often already at about 20 MB / s circuit.
In addition to card readers, which one operates internally or externally to computers, of course, should include the digital camera used, videocam, tablet, etc. support this standard in order to realize, for example, a particularly high number of continuous shots or to act as fast mass storage expansion (read / Memory Speed ).

To test the Toshiba EXCERIA Pro UHS-II I have the Kingston MobileLite G4 uses card readers on Windows and Mac OS, as well as the internal card reader of the MacBook Pro Retina 15.

At the Mac I've used as test software and AJA on Windows computers AS SSD and ATTO.

Depending on the card reader and test methods (benchmark) the results fall out very differently. Perfect conditions offers as already mentioned the Kingston UHS-II memory card reader. On MacBook Pro, however, the reader is limited to UHS-I level. Ever, the Toshiba EXCERIA Pro UHS-II at another UHS-II memory card reader again better on slower devices but also do worse.

Test environment:

MacBook Pro Retina 15 (AJA)
Read: 85.2 MB / s
Writing: 47.0 MB / s

MacBook Pro Retina 15 with Kingston MobileLite G4 (AJA)
Read: 198.3 MB / s
Writing: 69.7 MB / s

Asus N76VZ with Kingston MobileLite G4 (AS SSD)
Read: 182.5 MB / s
Writing: 47.4 MB / s

Asus N76VZ with Kingston MobileLite G4 (ATTO)
Read: 214 MB / s
Writing: 205 MB / s

Conclusion:
Although Toshiba EXCERIA Pro UHS-II does not meet the manufacturer's specification even in the best case, the test environments, it works usually significantly faster than many competitors with slower transfer interface. This becomes especially noticeable when the equipment used to support the fast UHS-II standard. If the personal equipment Park but still lags a bit here, you can (still) confidently take up cheaper alternatives without UHS-II label and wait which certainly takes place over time price adjustment.