One thing that I noticed was that the SanDisk Extreme 90MB/s cards are no longer manufactured. They've since been replaced with the Extreme Pro 90MB/s model which has not been added to the official approved media list as of yet, so I didn't link them. Also, take note of the peculiar Delkin Devices Serial Number compatibility issue.
§ Cards are compatible with the 788T
± Cards are compatible with the 970 (missing one or two cards exclusive to the 970)
Approved for 788T only (no 6-Series)
|CF Card||16 GB||SanDisk ±|
$45 - Extreme Pro; UDMA7; 90 MB/s