After using the Intel Workstation Board S5000XVN with a pair of yet-to-be-released Xeon X5365 'Clovertown' processors, its safe to say that this is by far the fastest system that we have ever built or used. The 'V8' incarnation that Intel showed off is not the average grocery getter, it is the muscle cars of computing. This system is reserved for those power users that don't care about how many Watts of power are consumed or how expensive this system will end up being, as this is about having the best performance and nothing more.
Having eight cores increased performance dramatically on multi-threaded applications where all of the cores can be put to use. For single-threaded use this system is no different than that Core 2 Duo that is more than likely already inside your system as long as it's running 3GHz with a 1333MHz FSB of course. The future of computing is headed towards multi-threaded applications, so down the road support for eight cores shouldn't be a big deal or even shocking.