if ur current cpu is c2d, i dont think u shuld upgrade to that c2q. as it wont offer any performance differences if u didn run any software that take full advantage of it. and there are hardly any games/software which is design for quad core.

anyway, expect cpu to drop further end of this year. i believe it will be as much as 50percent for c2q. since there will be competition from amd quad core as well. my advice is that, wait for amd quad core on the market 1st, baru u start thinking of the c2q. coz it will get super cheap by then.

. of coz future software will be multi thread coded. the thing he is asking now is how much further the quad core will drop in price. indirectly asking whether he shuld buy that 6600 quad core or not now.