Just to note, must get the Extreme Pro, because the K3 can take advantage of it. Also, if you write to both cards for redundancy purposes like I do, then there will be lag. I got 2 x 32 GB Extreme (Read: 80MB/s, Write I think 60MB/s) and my results seem to be slower than what others have experienced with Extreme Pro (still got lag but shorter).
Yes, I'm using the Extreme Pro, but because I've got only 1pc while the others are those slow Ultra (30Mb/sec), so when I use both, the writing speed is pretty slow.
Will be getting another Extreme Pro soon.
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