The SanDisk 256GB Extreme is a pretty fast card and it's V30 certified so it should be perfect for the 4K on the GoPro.
The software I used to test the SD cards: https://cam-do.com/pages/sd-card-speed-tester
Grab yours on Amazon: https://amzn.to/2FH3a6R
Grab yours on AliExpress (didn't test if it's the real one): http://bit.ly/2I185SB
Sandisk Extreme Pro edition:
Grab yours on Amazon: https://amzn.to/2HMwL1V
Grab yours on AliExpress (didn't test if it's the real one): http://bit.ly/2WqWCjo
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