I'm wondering why the Nikon MOV files (h 264, 1080/30p) files stutter in Premiere 5.5. Doesns't matter if "CUDA" is turned on or off. They play back so smoothly in any other media player (Windows Media player, Quick time player, etc. and at full res.) The similar files from my Canon 7D also play back much more smoothly in Premiere 5.5. I'm wondering if the Nikon D600 is too new for Premiere 5.5 and if I need to upgrade to version 6. Any ideas? The system is running fairly fast - Win7 Pro X64, Intel 3770K (not yet accelerated, 16GB RAM).
To add to Jim's remark, the reason is the .MOV extension. That causes PR to use QuiRckTime and that is a 32 bit application. It completely destroys the 64 bit nature of PR, thus reducing available memory to around 3.3 GB, even if 64 GB is installed, increasing the swapping to pagefile, slowing down your system even further.