Hello everyone, i dont know what to do. My computer is HP Compaq dx2200 Microtower PC, on the Ram slot it says 1.8 volt, the current RAM is: RAMAXEL:RML1520EG38D6W-667 512MB 1RX8 PC2-5300U-555, now i bought these two:Kingston KHX6400D2K2/4G DDR2-800 4GB HyperX Memory Kit it says its 1.85 volts...