No problem here with recording raw with an external monitor (SmallHD DP4) attached via hdmi. Sometimes I'm even running 2 monitors (one larger for the director) in tandem, still no problems. The one thing you won't be able to do is properly display the 3x sensor crop on an external monitor. Also, use the fastest CF cards that fit your budget for trouble-free recording, especially on 128 GB + cards. I had no luck going 1080p on Komputerbay 128 GB... and eventually, Midphase is right, the safest thing is to test it out for yourself!