I wanted to ask how much ram do you think is needed for using the AE CS4, and I'm talking about some projects with many layers, effects, etc.
I have 4GB and vista64 (quad core), but it is slow. I thought about upgrading to 8GB, but maybe to 16GB?
Short answer: As much as you can afford and fits into your system. 8GB is quite okay, but if supported and within your budget, 12 or 16 GB would be advisable, even more so, should you plan on using Dynamic Link or Adobe Media Encoder at some point for background rendering. Even under normal conditions it's just nice to be able to have more programs open while AE is happily working in the background...