hi,iam not sure if i buy a ram or a power supply i have 256mb kingston pc2700 and it can handle up to 440mhz with 2.9v and a 250 watt FSP powersupply.i know i have to change both of them but which one will you start with i have p4 [email protected] to 165 fsb with 1.7v. which one will you choose corsair 512mb pc3500 or enermax 550watt?.thks..