i have an ati radeon 3870 im thinking of purchasing one for crossfire but now since i saw the 4870s are released should i purchase another 3870 or sell my 3870 i already have and buy 4870? also at the moment im running 600watt ocz powersupply would i be able to run 2 3870s in crossfire or do i need to go ahead and get another powersupply? im getting ready for far cry 2 that the reason i wanted to get another 3870