http://www.tomshardware.com/2006/09/10/four_cores_on_the_rampage/Compared with the already not-too-shabby Intel Core 2 Duo/Extreme, the Core 2 Quadro can give performance a mighty tweak - but only for specific applications. In the best-case scenario, performance can even be doubled. However, this depends on the particular program. Software makers have yet to initiate the needed optimizations for multiple physical CPU units
The future belongs to HD content. If we take our benchmarks into consideration you can no longer get by without a quad-core processor. Test results with the software packages Main Concept with H.264 encoding and the WMV-HD conversion make this very clear. We noticed performance jumps of up to 80% when compared to the Core 2 Duo at the same clock speed (2.66 GHz).
Well this should get interesting, supposadly the first retail ones will be in mid october (according to toms).