Is it really worth it to put 2GB DDR2 533 PC4200 (2 X 1 GB) on a P4 3.2Ghz with an 160GB SATA system? or is it more effective to put 2GB over 4 X 512MB, (the max of the mobo is 4GB) so if i wanted to upgrade later id not want to waste money and just get the 2 1GB now, but is it really worth it or is it a better idea to get 2 X 512MB?