I am upgrading my HP PAVILLION DV1000 NOTEBOOK from 512mb to 1gb but I have received mixed reviews in what kind to purchase. I may sound like a newb but is there a difference between SDRAM and SODIMM? I got a link from someone for everest and it told me I already have SDRAM, however, every where else says laptops use SODIMM. SDRAM is remarkably cheaper and if i can use that, i would like to. Also, is it possible to use 400 mhz as opposed to the recommended 333? Sorry for sounding like a newb. Thanks to anyone who can help.