Render time improvement

I currently run an Intel 2.67Ghz Core 2 Duo with 2 GB of ram, windows xp, and premiere pro. It currently takes about 3 hours to render 1 hour of video shot in 1080 with my HVX200. I want to upgrade to a dual quad core system with 4 GB of ram and dual Xeon quad core processors (2.33Ghz). Any ideas how much of a render improvement I might see? If it is 50% or more, I'll go for the upgrade. Any less and I'm not sure the cost is worth it.
 
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