The 4800 is already a fast single core solution, just that now it can also perform fast in multi-threaded applications. I've heard that it makes the windows experience much better, and you will get more performance in games due to the lack of background tasks annoying gaming performance. Later it will also give you extra boost/stuff in games due to dual core support.
Plus I can justify the price over a super expensive single core solution.
Plus I can justify the price over a super expensive single core solution.