I run 64-bit Windows with AE and use Nucleo Pro to access all 10GB of RAM. AE can only use 2GB but Nucleo runs multiple instances of AE which can each use 2GB of Ram (sort of). My explanation is a little weak but you get the point. Bottom line is that AE screams now when loaded with Ram and NPro.
Sean Cusson
Q media design
sean@qmediainc.ca