I’ve been testing a lot of different SD cards with the Sony FX6. I have been a long time user of Integral, Lexar and SanDisk cards and generally found them to perform well and to be reliable. But in my search for affordable v90 SD cards I came across a good deal on the ProGrade v90 64Gb SD cards.
I hadn’t ever used the ProGrade brand before and their pricing almost seems too low. But I decided to purchase one to test. Well I have not been disappointed. The card performs very well and has no problems at all with all of the XAVC-I frame rates up to and including 60fps.
If you try to use it to record UHD at 100 or 120fps you will get an “unsupported media” warning but the camera will try to record to the card. Most of the time the recording will be OK provided you keep the duration short and don’t try to stop and then restart recording too quickly. Of all the SD cards I have tried this seems to be one of the best.
However you will still see recording failures with this card at 100 and 120fps. Often resulting in the card suddenly becoming completely full. So I still would not recommend relying on any SD card for 100/120fps UHD. But, as I have said this is one of the better cards that I have come across and given the low price it seems like a winner.
Other cards I have been using successfully with the FX6 are:
Integral Ultima ProX v90 for all codecs including XAVC-I up to 60fps.
Lexar 1667x Professional v60 for all codecs including XAVC-I upto to 30fps.
Sony Tough CFExpress Type A 80GB for all recording modes and formats including UHD 100/120fps.