I own a sony vaio pcv-rs420. Came with the ASUS P4SD-VX OEM board and a P4 2.8 w/HT and 512MB of PC2700. Neither Sony or Asus will give me any specs on the board. Sony states the bus speed to be 800mhz. How can this be if PC2700 memory is DDR333. If anyone can help i'd love to know what my board is capable of and if I upgrade to PC3200 will I get a true 800FSB as stated in the specs by Sony?