Hey Digi, dual 500 (year 2000) or 2001 dual 533 for use w. PT 5.1???

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I see the 2001 dual 533 G4 is qualified on the digi compatibilty sheet however I'm hearing rumors of people having to revert back to PT 5.0.1 or disable the second processor for stable performance.

What's my best dual processor bet for PT 5.1 bliss - last year's dual 500 or this year's dual 533?

I'm going to be getting a new machine soon and I want that second processor for use with app's that will benefit from it such as (Unity, OS X, etc.)

Thanks all for your input.