I just upgraded to a 4core 2.66 mac pro with 5 gb of ram and a 1900x video card. However, when editing in FCP I am still getting the ORANGE "unlimited" render line on certain clips when I try to playback in the timeline. It stops when it reaches those clips forcing a render and slower work flow. The clips are uncompressed 640 x 480 with a data rate of 19.9 MB/sec. I had the same problem on my PB G4 that I just replaced and assumed that this machine would not have the same problem. Is there a setting, or hardware configuration that might remedy this?? Thanks.