Komputerbay 16GB CompactFlash card Professional CF 600X 90MB / s Extreme Speed UDMA 6 RAW 16 GB (optional)
From a total of 3 ordered CFs I had already 1 return defective. UDMA 6 / 600x I can not understand in my PC and the camera so it seems slow. (This is a subjective opinion, does not constitute a rating, the speed was not measured it)