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SDXC U3 cards can easily write at 90MB/s, which is obviously nowhere near 2GB/s of a fusion drive, but it's definitely good enough for recording 4K video and taking large pictures - which is what this card is going to be used for. No one expects it to replace your SSD.



Worth noting that rarely any 2.5" HDD is faster than 100 MByte/s at 100 iops. This SD card could well come near that.


I wish but I am yet to see an SD card exceeding 10MB/s in practice.


Kingston UHS3 gets over 90MB/s in sequential read/write, and over 10MB/s in random read/write:

http://www.storagereview.com/kingston_sdhc_sdxc_uhsi_u3_revi...


What device and card are you using? The MacBook Pro will do 90/40

http://images.anandtech.com/reviews/mac/retinaMacBookPro/qui...




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