MY MOTHERBOARD DOESN'T SUPPORT MY RAM YET IT DOES,HOW IS THIS POSSIBLE?

You got the info from cpu-z? if that is the case note that it mentions the actual Ram speed. The 533Mhz and 667 etc are double that speed because of the dual channel technology you can use to achieve those speed. so 266,7 x2 makes roughly 533 and 333x2 goes for 667. To take advantage of this you should by another same stick and put it in the corresponding slot of the other pair of memory slots than the one you have already installed. E.g. if your current stick is in slot one of the first pair then you should put it in slot one of the second pair. Nevertheless, my advice would be to buy and use 2x1 GB 667Mhz and remove altogether the 512MB 533.