with XF605 (latest firmware 1.0.5.1) using SanDisk Extreme Pro 170MB/s SDXC V30 I U3 10 CardsI am able to record with the following settings: MP4(H.264) YCC420 8bit, 3840x2160, 23.98P... which has a bit rate listed as 150Mbps. No memory card message...
