I'm going to install an Asus model M5A78L-MLX plus mobo into a pc. This board will hold a maximum of 8GB DDR3. I'm currently running Win XP 32 bit. I know it can only use the first 4 gb of memory however if I install 8GB, then I would be ready for an update to WIN 7 64 bit. Is that correct? It won't matter that there is an extra 4GB sitting in there. correct?