FCP 7.0.3, 4x3Ghz CPU, 6GB Mem, RAID 10 but playback still choppy!

Hi,  this is a bit crazy.  I am editing a ProRez project and I would consider my MacPro reasonably powerful but when I play for 30 seconds or so the playback goes choppy.  I have to stop and start and then get another 30 second chunk playing smoothly, then choppy again.
I am not playing on a external motor or doing any type of playback preview, I do have a Blackmagic Intensity card but am not using it.
I have checked all the drive settings (User/System Settings) and they are all pointing to the RAID array. 
RAID conested to Mac with FW 800.  I have done speed tests with blackmagic SW and got over 50MB/s read/write.  Project is 22 mins.  Format is ProRes 422. I am using Lion OS X.
Any ideas?
Ben
PS it now seems to be working a lot better but still cant play whole project.

Sorry, should have read your title more closely. Here's a handy reference doc on Pro Res specs. With respect to speed your setup should have no trouble. Do you have another drive you can use as a test media drive? Also, forgot to ask about available space on systems drive.
Russ

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