I use a P4 3Ghz proc / 2GB RAM / 2x300GB RAID 0 / GeForce 5200 and editing uncompressed SD works absolutely fine. For DV work you don’t even need a RAID, a single 7,200rpm drive should be fine. It always helps to have you apps on your system drive and have a separate media drive if possible.
Like everybody has said though – if you’re dealing in uncompressed HD and/or have client attended sessions then you’ll need to up the power and get a faster RAID.
*Production Studio Premium / *Combustion 3
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Win XP Pro SP2 / Intel P4 3GHz / 2GB RAM / GeForce FX5200 / DeckLink Pro / Sony BVM-20G1E / DVS SDI Clipstation / 110GB boot/80GB media/600GB RAID-0