Write speeds vary wildly with sd cards, especially cheaper ones. The read speed is only achieved (and this is real world as I've some 600x SD cards) if you have a USB3 card reader and a USB3 port. Otherwise, you're never going to see those speeds in real life. Write speeds can be one number, but factors like camera buffer can affect real life performance.
If you're shooting 4k video, try and find the fastest writing cards. According to Lexar's website, their 600x write
minimum 90MB/s.
What does 100x, 200x, 400x, and 600x (1x=150KB/s) performance mean? | Lexar 
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