CATIA v5 does not use dual CPUs as far as I know. At my company we have workstations from Dell with dual Xeon processors, 1Gb of RAM, Quadro4 980XGL graphic-cards and SCSI-HDs. If you don´t use your system to anything else than CATIA I would buy a very fast P4 with a 800MHz FSB, at least 2Gb of RAM, QuadroFX 2000/3000 graphic-card and a SCSI-HD. That is my personal experience when I compare the workstations at work and my own similair P4-system at home.