CS4 is not as resource hungry as CS3. It performs very well on my AMD Athlon 64 x 2 dual core 3800+2Ghz with 4 Gb ram and Nvidia Geoforce 6200 Graphics card on Vista Ultimate. However I've not tried any 3D rendering, probably never will.
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Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.