okay, my old rig has 2gb (2x1gb dual channel) of ram in it. if i put in 4gb (2x2gb dual channel) of extra ram, will there be any performance hit, given if they are both 800mhz (pc2 6400)? i assume they will run at 800 still. but does the unevenness of the 2 dual channel kits have any effect?
also, does ram slot order matter (slot 0, slot 1, etc…)?