There is no QuickTime 64bit so you need to render out a sequence of tiff files and compile them after. QuickTime pro has the option to open an image sequence and this can then be saved as a mov. The mov file will be very large because it will be uncompressed.
If you look in the Maxon program directory you may have the 32bit version. The render time will be slower as you won’t be able to address as much memory in the 32bit version. I have 6gig so the difference between render times is quite a lot. The project I’m working on at the moment the render time for a frame increased from 9s to 16s.
Hope this answers your question