I’ll chime in with what I’ve researched over the last year or so (still waiting impatiently to get go ahead on my new system! but here it is…)
XP32 can only see 4GB RAM max, despite what kind of processor you have in there. Iin reality you will only see 3-3.5GB after OS/PCI Express has taken it’s share.
Each app can only address 2GB max, unless /3GB switch is on..which depending on your configs can be unstable. AE CS3 and Nucleo Pro can however use the extra 1-1.5GB via AE’s extra render instances, so 4GB RAM in a 32bit system does make sense.
Quadro just for AE makes no sense, unless like Tim you’re using it for extra monitors or the SDI out direct from the GFX card. But for accelerating AE any further, forget it. Premiere might use it a bit more, but Quadro is still overkill for that. Apps that would use the Quadro effectively are high-end grading apps like Idiras, Speedgrade, Color, Scratch & FilmMaster. Certain 3D apps would also benefit, as would Toxik, Fusion, Nuke, etc I think.
To get the most out of AE get the most cores possible on XP64 or OS X and make sure you have AT LEAST 1GB per core. Get fast RAM and big fast drives and keep your system drive, projects & media all on separate drives.
*Production Studio Premium CS2 / *Combustion 3 / Mocha v1
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Win XP Pro SP2 / Intel P4 3GHz / 2GB RAM / GeForce FX5200 / DeckLink Pro / Roland DS-5 monitors / Sony BVM-20G1E / DVS SDI Clipstation / Wacom Intuos 3 A4 / 110GB boot/80GB media/600GB RAID-0