I have a Canon 6D and can currently shoot RAW Video at 1600x728 on my 32GB 45mb/s card for about 30 seconds which is nice. If I was to upgrade to the sandisk 90mb/s card, would I gain anything from it considering the 6D buffer is 40mb/s? my current card write speed on average is 38-41mb/s.
A1ex found a way to overclock SD interface:
https://www.magiclantern.fm/forum/index.php?topic=12862.msg199224#msg199224
Highly experimental and mostly tested on Sandisk Extreme Pro 95 MB/s. Problems with 512GB variety, though.