Experimenting with FCP/ Real time rendering question

Hello, I am preparing to purchase a Mac Pro and spent some time at the local mac affiliate store playing with FCP and motion.
In fcp I took two clips and dropped them in the timeline, adding the 3d cube transition, and some filters to both clips.
I was looking at performance of real time rendering on teh base config of the MP I plan on purchasing.
I then added another clip above these two, intending on dropping the opacity to further push the RTR (real time rendering). This clip overlapped the transition of the two other clips in v1 and v2.
When attempting to play the timeline the viewer window now said "Not Rendered"
My question is:
Is there a limit to how many tracks can be run under the RTR? Why did I get this message?
My main reason of the move to a Mac Pro is to get away from constantly pre-rendering.
Thanks everyone in advance!

In fcp I took two clips and dropped them in the timeline, adding the 3d cube transition, and some filters to both clips.I was looking at performance of real time rendering on teh base config of the MP I plan on purchasing. I then added another clip above these two, intending on dropping the opacity to further push the RTR (real time rendering). This clip overlapped the transition of the two other clips in v1 and v2.
Sounds like you know what you're doing and what you expect. A factor that has not been mentioned yet, besides RAM, prefs and drive speeds, is your video format.
Also, the new rev of FCP is taking advantage of tons of processing overhead, vastly increasing the amount of stuff you can do in real time. However, real time is largely a preview operation, regardless of the machine or system, unless you are using proprietary codecs, such as Media 100, that might be hardware-assisted. Output is almost always a rendering issue, multiple stacked or processed layers require the creation of new media.
The only way you're going to be able to decide if Macintosh and FCP are right for you is to demo thoroughly and that requires using your own footage.

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