in theory, a Dual core Xeon will give you faster rendering, since it mainly relies on CPUs, but the i7 will probably be more responsive. If you do 3D as well, then the dual quad is the way to go. Basically they are really so different that it's hard to do a side by side comparison. The i7 loses the front side bus for what's called the Quick Path link, so that's a big advantage, and the motherboards are much more upgradeable. There are certainly plenty of benchmark out there for you to look at. Last week I built the following system for a Premiere workstation and the performance is outstanding: i7 920 Gigabyte EX58-UD5 12Gb DDR3 memory (G Skill) 128GB SSD drive for OS (Vista 64) (4) 1 TB Seagate 7500 in RAID 0 on 3ware 9650SE controller. All in a Cosmos 1000 case The i7 is very memory hungry. I find Premiere going over the 6GB mark during rendering, compared to 3GB on our Core2Quad machine.
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