Thanks Walter,
Yeah, I have faster/Less accurate selected. And as for the output, I have tried all 3 options for the HD1080 (23.976->60) (8, 16 and RGB outputs.) My comp is 24P, 8 bit. This is typically how I work. None of the setting play realtime. In the control panel I have BM settings as hd1080p 30 and no output processing. This is similar to my old machine.
As for Quicktime, unfortunately, the .mp4 does not play on some clients machines. I have tried with and without changing the ending to be .mov and they still cannot play the files. This includes my sound guy, who should be better equipped.
The .mp4 is a smaller file, I would use it happily if I could.
Thanks
Vince